I wonder why they were both arrested?
Is it a crime to simply watch or be present at a street brawl these days?
I once saw a brawl between a few Thais where one killed the other with a machete, nothing to do with me, I carried on drinking my beer in the distance. The injured party went to hospital and died later.
The cops didn't look for witnesses, nobody cared as it was a group of low level scumbags fighting between themselves, the machete guy did a couple of years in prison and was released long ago.