[Once Harry arrives, Snape proceeds to give him an incredibly flat look. He's been here a total of thirty minutes and he's already head enough of this insufferable truth-telling. Nothing Harry had said was particularly bothersome, but the potential for irreparable damage was there.]

How kind of you to take the time to appraise my character, Potter.

[His tone is as caustic as ever, and he folds his arms over his chest as he considers how best to answer Harry's question -- and then finds himself answering without having a chance to give it much thought at all, actually.]

The death of Albus Dumbledore.

[He narrows his eyes, examining the boy without moving from where he stands.]

Something it seems your friends here have not yet been made aware of.