Trash talking is a time-honoured tradition of fighting. However be careful to keep it to standard generic banter and ritualised "yo mama" insults. Because if you try and get too creative, or customise your talk to what you actually know about the opponent, and accidentally touch a trigger issue and really rile them up, you may well regret it.

Transcript

Trooper 5: Hey, go report this. We've captured a rebel.
Trooper 6: What about that Ewoc?
Trooper 5: Forget him. I've been to one of these seminars before and it was a waste of time.
Wicket: I'll show you a waste of time!
[SFX]: kneecap!
Leia: While he's distracted I grab a branch and...
[SFX]: clobber!
Leia: I shoot at the other one. 15.
[SFX]: Pow! Pow!
[SFX]: Kaboom!
Wicket: Take that, you communist scum!
Wicket: So. Would you like to come to a seminar?
Leia: Uh... sure.