Well. That kills the fun of that instantly. Justin isn't so dumb that he can't see how freaked out Jin is. He hadn't thought about it; killing humans is Justin's very nature, He hadn't thought about the fact that it wouldn't come easily or happily to Jin.

"I didn't sign up for this," Justin reminds Jin, not for the first or last time. "And look, before you get into it I know you didn't either. Spare me. It's just that you need to kill in order to live now, honey. Or you can let yourself wither away after all the trouble I went to to divorce you from your maker. It's fine, you don't owe me anything."

"You figure out what kind of noble way you wanna pick 'em and I'll do it for you. Because apparently my generosity knows no bounds. You want 'em sick? Dying? Will that make you feel less guilty?"

They both know it won't, but if Jin wants to kid himself...