"Severus!" she cries desperately, "That was an innocent boy, just a little boy! What you did to him-"
"He was a filthy, disgusting half breed!" He snarls back, "He deserved every-"
"No he didn't! He was helpless, weak, powerless—I would have thought—you of all people—what your father did-"
"Do NOT bring my father into this!" He thunders, incensed, "I am nothing like him."
She bites her lip, knowing what she has to say will sting, but knowing too that she has to say it.
"You're right," she answers evenly, "You're not like him.
You are him."