Other trope options in this instance could be the MC inexplicably accepting the antagonists surrender and becoming life long friends with the antagonist. Or the antagonist seeing that he can't beat the MC, surrendering while sneakily preparing a knife or poison or whatever to kill the MC, but MC...
when he gets back is the village going to be burning with all the elves dead except for the girl, who dies as soon as she says "WHY DIDNT YOU SAVE US MC!"?
When she shot that beam that missed him it should have Vegeta'd half the crowd. Not so funny to help a murderous stranger attack the person who saved the world and you personally now, is it?