If you can't Beat 'em Fistfighting bug

While fistfighting against the brawlers behind the tanners house while particularly indimiating, (through perks, buffs, stats etc) you’ll sometimes scare the one you’re fighting off, he’ll jump out of the arena and not come back. If you leave the arena you instantly lose, but I can’t chase the guy who fled down either. So I’m stuck on this quest

Also the wounded loudmouth in the same quest died cause I didn’t treat him before I started this quest, but I still have the objective.

The worst bug I had here made progress impossible. The one your fighting gets scared…runs away screaming for help then guards and bailiff turn up…fine you walk away…start quest again this all happens again then I screw up try to surrender by pressing L1 and x at the same time. Instead of L1 then x. So I end up trying to pickpocket a guard in front of 15 other guards who then decided to smash my head in with axes before I can react…