Mays hit his head. He was on a plane. Didn't have his seat belt, plane dropped a little and he hit his head on the ceiling. He felt fine leaving the airport.
But as was the case with Natasha Richardson earlier this year... just because you feel fine after hitting your head doesn't mean you are fine.
I'm pretty sure a luggage fell on his head when the plane's front tire blew up. According to FOX "several people were reported having bumps and bruises." Those several people must have all been not wearing their seat belts then. I heard that the Airlines claim Mays wasn't wearing his seatbelt.
But whatever.