Yea, so what?!
He didnt bother anyone and he looked pretty safe to me.
Firing his pistol, in his basement, at a stack of cards and books, straight down, inches from his own feet, the target was not secured to the floor, etc. Fragmentation, yaw, shrap, any of these things could have occurred. It could have yawed out of the cards struck the surface of the floor (which looked like a basement, so i'm presuming there is concrete under that carpet) and fragmented in all directions and into his foot and leg. His little disclaimer at the end about knowing the limitations of his round and how he has his round right there is a sad attempt to cover for a blatant disregard for common sense and firearms safety. He could have made the same point outside with a secured target. Just because all turned out well doesn't mean what he did was sensible.
The guy in the video strikes me as the kind of guy who will muzzle sweep you 100 times at the range then get touchy when you point it out and say something like "aw it aint loaded stop being a sissy".