Some excellent suggestions already.
I think the one that captures it best is probably to run a contest of troll tactics versus player tactics. The Humans could defend with close combat and the like (suitably penalized for darkness) but would be limited in their attacking abilities to tactics and skillful improvisations like "patient" or "clear thinking" to avoid expending effort and magic. Both sides could still inflict wounds and so forth on opponents (representing loss of resources as well as physical wounds).
Thom
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