Remember that "Sieze by force" is just a move, it's not combat rules. I mean, there are no "Roll initiative, choose manouver"-combat rules in Apocalypse World, save for maybe the peripheral battle moves.
Instead, conceptualise the game as fiction happening through freeform conversation, where the moves come in and modify the fiction. Unless the move explicitly changes something in the fiction, the fiction happens as established.
And make sure the players state what they are doing and what they're trying to achive by doing that, and then you pick the move accordingly. If they're trying to get a hold of the antidote the NPC holds, maybe it's actually Acting under fire, the fire being the NPC throwing the antidote in the fire before they can react.
So, think fiction first and then pick the move (if any: if there is no question about it, it just happens, no roll necessary) accordingly.