[ It's just a different form of weapon. But in this case, he's not trying to make her into a killer. He's trying to prevent her from being someone else's pin cushion. ]

I know that you're trying. But you said yourself that you planned not to read the files at all. I'm giving you advice, Clary, that's what a teacher does. In the end, all I'm ever trying to do is teach you to protect yourself. Where I think you aren't, I will say so. I won't apologise for that.