To be fair, I think "trigger happy" is a very accurate description of goblins. You can talk to the next group like nothing happened because the first group wasn't in vision of the second group. They don't know what happened.
The situation with Wyll should just be made impossible. I don't think a "talk in combat" is a great option, but a morale indicator might be a good inclusion. If you're fighting a lot of goblins and you kill most of them without any of your characters being downed, the others could surrender.
