The rules of the tournament are just a bit weird with the 10 second countdown. We've had grappling and even opponents on the ground getting pounded but the fact that they were on the ground didn't start the countdown nor prevent the fighter from getting attacked further (or just grabbed and thrown out of the ring) but here we have a match where a fighter is getting thrown, is essentially incapacitated for several seconds, and yet no further attacks are performed; Arashiyama just waits for his opponent to get back up to throw him again.
It seems the rule was implemented to somehow stop the match if a fighter can't get back up but there aren't any rules to do something about getting choked.
Or perhaps Arashiyama does have the freedom to keep attacking his downed opponent but doesn't do it because he's not proficient at it and completely relies on knocking out his opponent by throwing him on the ground.
It's a pity we're not seeing any strikes here, as if Arashiyama is a master of redirection and controlling both his center of gravity and his opponent's it'd be interesting to watch. Well, hopefully Hayami will start showing something here, but his claim that Arashiyama is three times stronger than him is making it doubtful.