Structure Materialization Freezes Unit
My demigod stood where an enemy catapult/trebuchet defense structure had been prior to its destruction. My Torch-Bearer was in the process of casting his Ice Storm spell (beyond his current range - he was about to walk within range) when the defense structure reappeared. My Torch-Bearer was displace to the side of the structure, but kept walking into the structure, unable to turn away from it and move on.
I commanded him to move to an empty space on the map and this sufficed to free him.