Knowing goku, he's too nice a guy to do that. Goku doesn't kill for the most part. Only if his enemy is an obvious evil that threatens all life does he try to kill them, and even then he's a bit hesitant. (for instance, he technically spared piccolo, and gave vegeta numerous chances to live when he beat the crap out him, despite him trying to kill goku left and right. ) No, goku would just keep fighting them until they got tired, and then he would fight them some more afterwards. The darkness, however, would be toast, and the minions of darkness would probably be demolished (except perhaps the fallen, they are semi-neutral)