QUOTE(mammaprince @ Sep 19 2006, 06:04 PM) [snapback]953606[/snapback]
Well the way Snape is, had he have known from the beginning that Harry had his potions book, I think he would have used it against Harry and not let him keep it. So I went with he didnt know until the bathroom scene, thats why he sent Harry to get the potions book, he wanted it as far away from Harry as possable. Just my oppinion though.
I think if Snape knew about it he would have been beside himself-talk about your invasion of privacy, etc. It would have been POA and OotP rolled into one-unless it was all his big idea in the first place. Then he can remain marginally annoyed with Harry and pretend he knows nothing.
To begin with the Christmas party-p.319 US HB
QUOTE
"I was just talking about Harry's exceptional potion-making! Some credit must go to you, of course, you taught him for five years!"
Trapped, with Slughorn's arm around his shoulders, Snape looked down his hooked nose at Harry, his black eyes narrowed.
"Funny, I never had the impression that I managed to teach Potter anything at all."
"Well, then it's natural ability!" shouted Slughorn. "You should have seen what he gave me, first lesson, Draught of Living Death-never had a student produce finer on a first attempt, I don't think even you, Severus-"
"Really?" said Snape quietly, his eyes still boring into Harry, who felt a certain disquiet. The last thing he wanted was for Snape to start investigating the source of his newfound brilliance at Potions.
"Remind me what other subjects you're taking, Harry?" asked Slughorn.
"Defense Against the Dark Arts, Charms, Transfiguration, Herbology . . . "
"All the subjects required, in short, for an Auror," said Snape, with the faintest sneer.
My thoughts about this passage, Snape doesn't give away much-but he doesn't think he taught Harry anything, so if he wanted to, maybe the book would be an excellent substitute. So if Snape is thinking Harry needs to be taught, he also knows what sort of teacher Slughorn is-will he push Harry or let him get away with things because he's special (and Lily's to boot)-then maybe he thinks the Prince can give him a hand. He also knows Harry doesn't ever turn in the things he finds-he's extremely secretive. Also, once Slughorn says no one's done better, Snape must know, because the book is doctored, and if he was the best in his class (or Lily was), Snape knows the only way to make an absolutely brilliant version is in his book. Snape speaks "quietly" which unless accompanied by an extreme facial expression or clenching fists is often an indicator. When he says "really?" I just picture a parent having been called by the teacher but their child doesn't know yet-"So any trouble at school today, Timmy?" "No, mom." "Really?" Lastly, McGonagall promised to help Harry be an Auror, she probably went on and on about it, Snape also recognizes the classes no doubt, if he is not evil personified, I think he wants Harry to succeed, hence only the "faintest sneer." So at this point not only do I not think he seems at all shocked but I also think he must know.
Next up-the bathroom scene!

pp.523-528 Obviously, I can't put it all in, so here are the chosen clips of Snape's attitude-
QUOTE
Snape had burst in the room, his face livid.
He supported Malfoy across the bathroom, turning at the door to say in a voice of cold fury, "And you, Potter . . . You wait here for me."
At this point Snape is understandably ticked. Whether he's trying to save Malfoy, Harry, or just two students, his anger is justified.
QUOTE
"Apparently I underestimated you, Potter," he said quietly. "Who would have thought yuo knew such Dark Magic? Who taught you that spell?"
"I-read about it somewhere."
"Where?"
"It was-a library book," Harry invented wildly. "I can't remember what it was call-"
"Liar," said Snape.
When Snape asked Harry he once again had to know already where he learned it, no one else had used it (so it wasn't like Levicorpus, going in and out of fashion). But he asks Harry anyway, why should he give himself away at this point anyway. He doesn't know what Harry knows about the book. I'm sure the first rule of spying involves just this sort of playing your cards close to your chest. But does he seem suprised? No. Then he does his little legilimency number on Harry.
QUOTE
"Bring me your schoolbag," said Snape softly, "and all of your schoolbooks. All of them. Bring them to me here. Now!"
Again I note that he's speaking softly, not sneering, not with eyes glittering with malice, etc. I also think if he really, really wanted the book back he would have gone with Harry to get it. But instead, he waits, which gives Harry time-think of DD telling Harry to get his cloak, when it was DD who told him to have it with him at all times. Snape is giving Harry time to do something with it, if he wants to, IMO. But Harry doesn't want to look bad to Snape or Slughorn, so he opts for hiding it.
QUOTE
One by one, Snape extracted Harry's books and examined them. Finally, the only book left was the Potions book, which he looked at very carefully before speaking.
"This is your copy of Advanced Potion-Making, is it, Potter?"
"Yes," said Harry, still breathing hard.
"You're quite sure of that, are you, Potter?"
"Yes," with a touch more defiance.
"This is the copy of Advanced Potion-Making that you purchased from Flourish and Blotts?
"Yes," said Harry firmly.
"Then why," asked Snape," does it have the name 'Roonil Walzib' written inside the front cover?"
Harry's heart missed a beat. "That's my nickname," he said.
"Your nickname," repeated Snape.
"I understand what a nickname is," said Snape. The cold black eyes were boring once more into Harry's; he tried not to look into them. Close your mind. . . . Close your mind. . . . But he had never learned how to do it properly. . . .
"Do you know what I think, Potter?" said Snape, very quietly. "I think you are a liar and a cheat and that you deserve detention with me every Saturday until the end of term. What do you think Potter?"
To me, this is not the Snape that threw Harry bodily from his office in OotP or was so "unbalanced" to quote Fudge in POA. He is hardly upset at all, compared to his normal "Potter"-stance. We know he certainly wasn't in the loop in POA and the extreme violation of privacy of OotP, I think, would be repeated here if Snape did not have a hand in Harry getting the book. He could have demanded it and no one would have been the wiser, he wouldn't have had to give himself away to get it. Harry will do anything not to disappoint DD for one, but he also doesn't want to disappoint Slughorn. And I think we all agreed that if Snape had wanted to push for expulsion it would have been at least possible at this point, even if he wouldn't have succeeded.
Lastly, the
Flight of the Prince-p.604
QUOTE
"You dare use my own spells against me, Potter? It was I who invented them-I, the Half-Blood Prince! And you'd turn my inventions on me, like your filthy father, would you? I don't think so . . . no!"
Obviously, I could quote the whole chapter but this is the crux of it-Snape is handling Harry fine, he's even OK the first time Harry calls him a coward, but once he starts on the spells, that's when Snape really starts to loose it. Why? One, James did the same thing. But surely whether Snape was involved with the book or not, he doesn't want Harry using the spells
on him. One thing I disagree on with
SoonerGryffindor is I don't really think it was a mistake to tell Harry, because I think Harry will have to come to terms with Snape at some point. If he recalls how attached he was to the Prince, that might actually help him, in the long run. But not right away, he's too upset at this point. But I do also believe Snape sort of knows his job is the scapegoat, so one more reason to have Harry hate him is not going to be the straw that broke the camel's back.
What is the point of this extremely long post-some reference material, so it's easier to argue but at the very least, I think it can be said Snape knew
long before the bathroom scene that something was up. I believe it was
Marielle that pointed out Harry hexed Crabbe in October. No doubt Snape would have recognized one of his own spells even then.
I dare not summarize
clunycat's background reasons for believing Snape would do this. But for me, the patient, cunning, behind the scenes style of both a spy and a slytherin as well as Snape's inate private nature, make it hard for me to imagine he would stand for Harry to have his book, unless it was his decision to give it to him. Of course, the fact that without Harry, Snape is doomed to serve Voldemort until he dies, might also weigh into Snape's decision, especially since Snape know better than anyone the state of DD's health.
I'm exhausted!

(Sorry for any typos, I just can't be fussed right now!)