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I have a large creature (dire-wolf) charging down a corridor 10' wide and crossing the square of a medium sized ally (duergar) as it does so. Obviously it has to move two times through the duergar's square to get clear. As it does this it triggers an opportunity attack from a PC in a connecting passage. The PC is a fighter with combat superiority and hits, so the opportunity attack should stop the movement.

But the wolf can't stop in its destination squares or the squares from which it triggered the opportunity attack because they are occupied. How should this be resolved?