I have been rolling it that it kills the entire minion group if you get a critical on your roll. For me an action isn't just one acti, it could be multiple shots or what have you. Though you only take "one" action
As if someone does 10 damage to a minion group I carry over the damage and it kills more than one minion.
So you'd think a critical would take out the group? Or would it kill one minion automatically and any other damage would just kill others?