Sirachoé
"Oh, Mika, ease up. Fisticuffs only for strangers, in the future. Dead people are not solutions, they are problems, and we want these people whole. Dead men tell no tales, and we want to know what the fight was about. So no elemental damage that could end someone's life."
SpoilerEverything aside from Mika's attack was explicitly nonlethal, sorry if that got lost in the rolls.
Mika's elemental damage can't be nonlethal, as far as I can tell.