"Only one!" Snape roars back -- omitting the one that he had a hand in, his own father, the only one. He'd never been a thug like Nott or a fanatic like Bellatrix; running about blowing up Muggles wasn't what he was after, and never would be. "And nly because he begged me for the mercy." But that'll be another story for another time, as Snape has no desire to retread Albus' death with Sirius Black. Ever.

Neither does he want to talk about STEALING HIS SPELLS. The counter is up in an instant, that strange melodiousness that he uses in all his counter-curses. "How dare you turn my work against me. Who do you think you are, dog? Let's get you LEASHED! Incarcerous!"