Different than football, but a coworker got shot in Iraq. Was sitting in a vehicle, bullet went through the door, grazed the top of one thigh enough to give him stitches, went in the other thigh about an inch deep and came out the other side of his leg. No arteries, just skin and muscle damage. Didn't even go home., just to Kuwait to get fixed up and he was good to go a couple weeks later.
Anyway, he said he heard the bang of it hitting the door, felt a little sting and saw blood but it didn't hurt. Said he got out and ran like a motherfucker for about 150 yds behind the wall of a courtyard where I guess friendly people were staged. Once he got there he fell down and it hurt so bad he couldn't even walk, said it felt like someone stabbed him and poured salt in it. He also told us that he had 70 some pounds of gear and a rifle in his hands, and he would've passed Usain Bolt like he was standing still. We laugh our asses off in the office when he tells the story. I kinda believe it, too. When you're scared absolutely shitless it's like your body has a couple extra gears.
Moral of the story, adrenaline is a hell of a drug. Riley Moss didn't get shot obviously, but he just picked off a pass in a top5 game in front of tens of million people. It would probably take a few seconds for that shit to set in.
Also, I'm going to assume that most of us have either been kicked in the jewels or taken a pretty solid nut shot in our lives at some point. Remember, it takes a good 5-7 seconds for that to register in your brain before it becomes incapacitating. It's like nature is playing a cruel joke on males by letting them know for a few seconds that they got hit in the nuts so we can live in fear knowing it's coming...and then...BOOM