If they were already off his property when the girl was hit then he's screwed, no two ways around it. But if they were on his property then he was within his rights to do what he did, we now know that it was teenage girls engaging in random acts of stupidity and illegality (tresspassing) but he could argue that it wasn't apparent at the time. Perhaps he's had problems with vandels and assumed it was more of the same, who knows. Property rights are property rights though, stay off the turf!
