From what we can piece together, these are two friends or acquaintances at a small gathering in someone’s apartment. And they decided to have a party and a fight by way of an impromptu jiu-jitsu match.
It seems to me that the dude without the shirt might have had some wrestling and a few street fights under his belt. The other guy obviously had done some jiu jitsu training and showed good, solid fundamentals and managed being under pressure well. I’d peg him for possibly a blue belt but I could be wrong. Neither looked in fight shape. Both seemed drunk.
None of the details are relevant anyway, because it ended up being a highly entertaining match. On hardwood floors! Dangerous, stupid, and reckless. But fun! We hope you enjoy it as much as we did.