In Dungeon World the GM makes moves according to a variety of situations. Without going into those trigger conditions, suppose a failure is rolled by a Cleric casting a healing spell and a GM move is to occur. One of the principles to guide GM action is:
Think off-screen too
Just because you’re a fan of the characters doesn’t mean everything happens right in front of them. Sometimes your best move is in the next room, or another part of the dungeon, or even back in town. Make your move elsewhere and show its effects when they come into the spotlight.
Now, suppose I (as the GM) make a move to Give an opportunity that fits a class’ abilities by re-animating a fallen foe earlier in a dungeon (The Cleric's abilities against the undead is what I'm trying to highlight), but then the players rapidly exit the dungeon. I have potentially two problems at hand:
The fiction becomes simply "Your spell fizzles (insert descriptive stuff here) resulting in no apparent effect. What do you do?" This doesn't demonstrate that I even made a move; is that ok?
The party is no longer anywhere near the re-animated foe. Is this move "wasted" until I have a chance to re-introduce the foe as the undead later in the game, supposing I have that chance at all?
In short, is it ok to have GM moves appear to do nothing from the players' perspective until a later time (with the possibility of never coming up again)?
