Professor Severus Snape: [to students]You are surely wondering why I have summoned you at this hour. It has come to my attention earlier this evening, Harry Potter was sighted in Hogsmeade. [students murmur to each other]
Professor Severus Snape: Now, should anyone, student or staff, attempt to aid Mr. Potter, they will be punished in a manner consistent with the severity of their transgression. [Professors McGonagall and Slughorn make pitiful looks]
Professor Severus Snape: Furthermore, any person found to have knowledge of these events who fails to come forward will be treated as... equally guilty. Now then... [walks down steps to students]
Professor Severus Snape: ... if anyone in here has any knowledge of Mr. Potter's movements this evening... [walks among students]
Professor Severus Snape: ... I invite them to step forward... now.
Harry Potter: [steps out of the crowd of students and everyone gasps]It seems, despite your exhaustive defenses strategies, you still have a bit of a security problem, Headmaster. [Great Hall doors open to reveal the Order of the Phoenix members]
Harry Potter: I'm afraid it's quite extensive, how dare you stand where he stood. Tell them how it happened that night! Tell them how you looked him in the eye, a man who trusted you, and killed him! Tell them! [Snape points his wand at Harry, but Professor McGonagall steps in front of Harry. Snape looks slightly taken aback, but readies his wand]
Minerva McGonagall: [Begins to throw spells at Snape. Not wishing to hurt McGonagall, he instead blocks and parries her curses, even throwing two of them over his shoulders to knock out the Carrows. He then swirls into a puff of smoke and jumps out of the window]Coward!