I have a story like this, but funnier.
My friend and I were in the car, I was driving and we were goofing around. I forget the exact order of events, but what happened was, I had twisted my friends arm. He took my phone (2g) and was threatening to eat it unless I let go of his arm. We were at a stalemate, until I hit a bump and he accidentally bit down on the phone.
He said ow ow ow, and I was like "OMG are you okay?" He said he was bleeding but no chipped tooth. I made sure we didn't need to go the the dentist or ER. When I was sure he was okay. I tried to strangle him.
Unfortunately, I didn't know that apple could fix screens, since this was the first iPhone model and all.
I wouldn't expect my friend to pay to fix my phone since we were both at fault.
In your instance, I'd hope he'd step up and offer to help pay for it, but at the end of the day, it is just money.
