I'm trying to put myself in Chai's position here and seeing that every one of those White hunters, including the woman(?), was bigger than me (if I was Chai's height at 5'4" that is), would certainly intimidate and frighten me. Without my gun I would stand little chance against any one of them (except maybe the woman), especially the hostile teenager and that one guy who took the stand (who kept on chewing gum?), let a lone all of them or a few of them at once, in a physical altercation. And even with gun I would still feel threatened enough with their sizes and numbers, as anyone of them could attack from a blind side and do serious harm.
I don't know about you guys, but when I was younger I found myself in a few bar/club fights against other ethnic ppl (dawb, dub, nyablaj, etc), and in the chaos you just punch/strike to neutralize whoever comes your way as you never know what they intend to do to you. Even when they are running away at that very moment from you, the threat isn't over, and they aren't about to give up yet, especially if you have humiliated one of their guys and if they have the numbers (as is the case with Chai's situation), will only regroup to corner you. Then you're in big trouble, as I and a few friends/cousins have found ourselves in before.
I don't think Chai had time to assess exactly how many guns those White hunters had on them, or who exactly had what, and/or who intended to fight and who was just there to spectate. All he saw and recognized was a hostile mob encircling him, an immediate danger to him, all the more because they shot at him, and so he strove to live in a life and limb situation.