If it turns out he has a neck fracture and ends up paralyzed, he can also argue that you forced him down on the backboard, despite the fact he refused, and the wrestling him down further irritated his injury and may have caused the paralysis and sue you.
did you not read the first part of the message.
granted it would make his injury worse if you have to fight him
just like i said this is a case of you're d*mned if you do and you're d*mned if you don't.