While GMing a Dungeon World session, I had the following (awesome) situation occur:
The players were guests on an NPC woman's boat. The woman had a magical book that the players wanted to have a look at, and they successfully convinced her to hand it over. While it was in the thief's hands, he decided he wanted to take it (because of course he did) and quickly swap it with a book he had. The paladin of the group wanted to draw attention to the thief by loudly shouting "Say Ben, what do you have there?" (Ben being the name of the thief).
This triggered the Interfere move, as the paladin was trying to hinder someone he has a bond with. He rolled and got a 6-, so I said that as the paladin shouted and raised his arm to point at Ben, he knocked over a pot of the boatswoman's supplies which smashed and caused her to become angry with the paladin, actually distracting her from the thief instead!
I'm not sure what GM move that would fall under (possibly 'reveal an unwelcome truth' or 'turn their move back on them') but am pretty happy with how that flows from the fiction.
I then had the thief roll to Defy Danger, as before the paladin chose to interfere, I had interpreted his sleight of hand as Defy Danger, with the danger being the boatswoman noticing the switch.
My question is: Given that in the fiction the boatswoman is now distracted, does the Defy Danger move still trigger for the thief?
Is the roll no longer necessary as she is distracted? Can I give the thief a bonus to his defy danger roll due to the distraction? (I know that DW is against using modifiers for representing difficulty)
Should I have had both the thief and the paladin roll their moves simultaneously, and interpreted the results together?