The ettin seems enraged at his prey escaping and leaps atop the overturned paddy wagon, scrambles over it, and then jumps down again, before ripping off a massive chunk of it and, his preferred quarry still hidden behind the next wagon, hurls it at the barely-visible Mags. It hits like (a large portion of) a truck, and Mili is struck by part of it as well.

This is not to say that the guard escapes. They sprout feathers. Or, rather, a feather, out of an ear. The other suddenly grows the tip of a quarrel, and they drop to the ground, to all appearances dead.

Spoiler: OOC
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Perception to notice where the bolt came from. Also, Mili takes 7 "splash" damage.