geroes
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Was there a save before this turn? Or is it just the map itself? What was near the gargoyle? I think there were monsters nearby that he killed, the turn ended, and he didn't have time to kill the gargoyle, resulting in this.
Also, he moved to a single adjacent cell that was under attack, killed some, but gargoyles don't attack on their own, of course. If he moves back and stands there, he will have to fight.
There's a save from turn 117 here, and the same thing happens. Wistan is standing close to the golems. He runs to the gargoyles, and there's no one else there but them.