She's her own worst enemy. And, without meaning to be, everybody else's. Besides, I think it will be good for you.

[ His voice has already lost its usual teasing sing-song, but now he sounds really quite serious: ]

I think, if you find yourself responsible for somebody who is reckless and self-destructive, with no regard for their own personal safety, it may help you become a bit more careful. There's nothing quite like looking in the mirror, hm?