Actually a lot of seniors are 18, so she had 0.00000% responsibility to worry about them
If even 1 of the students had gotten hurt there would have been Hell to pay, regardless of age. At that age I was a little dickhead, but back then, if something went wrong everyone would have said, "The little dickhead got hurt being an idiot." Now people want to file suit and crucify someone else for their own stupid acts. I don't know how the Principal could win in this situation. (and I had a lot of experience in the Principal's office)
