Study the Sword
When you observe closely the fighting style of an enemy roll + INT. On a 10+ you learn their alignment and their player must tell you one revealing fact about their psychology. On a 7-9 you learn some interesting trivia about the school at which they trained. On a miss, you are sorely misinformed, giving your foe some advantage over you.
I love it. Great for a wuxia, swashbuckling, or fighting anime feel, and can give you some neat fluff to work with in the narrative.
Thought for the miss result: on a miss, they learn something about YOU! You’ve made your own psychology obvious in your study of their technique!
Or you are so focused, another one blindsides you.
I think “some advantage over you” is general enough that a GM can cause all sorts of hard or soft mayhem, rather than going specific.
In that case, wouldn’t it be better to leave off the result? Because I’d do that if I was handed a regular miss. But I note that *World games do have a handful of moves with specific results on a miss.
Describing a general miss result aims the GM at a flavour for their response. It’s a cue to make a move within the theme of the players’ failure.