This whole thing's different from what we're used to. Normally we just dust 'em immediately. [There's a glint of something dangerous in her eye. The kind of thing that very much suggests that Ozpin is probably lucky this confrontation and reveal happened with Willow present, because Faith has no emotional connection to this guy, she just sees a monster trying to cover it's tracks. It takes one to know one.]

If you know who Buffy is, then you should know what a Slayer is. This could have gone a whole lot worse for you. [And it still might, if he gets worse.]