im guessin some sort of contusion in the gluteus maximus region and the dudes sprayin some sort of anti-inflammatory agent or maybe even nitric oxide in that region https://en.wikipedia.org/wiki/Nitric_oxide#Biological_functions
I probably should have put a warning on that one. There's video of that on youtube. He just pops back up and chases down the manager of the other team and yells at him.
As some one who has decades of experience with hazardous gasses, you would never want to be exposed to nitric oxide gas. It would form nitric acid in you lungs. Then you die. Nitrous oxide is another story. It appears to be some form of cooling agent. Pretty much decompress any compressed gas, and it with auto refrigerate. I'm going to guess they're cooling off a skid mark.