... a child dodged demons until he starved. Not passed out, not even dehydrated. That isn't a ninja, that's a glitch in the matrix turning one dwarf kid into Urist McNeo
I think that's probably the best way to some this up
then again I had something similar except it was so much worse... forgotten beast takes on a nest of antmen, kills all but one drone who simply uses the beast as a training dummy as it spends 100+ report pages fighting it and eventually wins with +5 legendary in spear, shield, dodging and fighting (can't remember what the attributes were like but I guess crazy high), for a while I would defeat my enemies just by baiting the antman too the harder to kill enemies and have it slaughter them, eventually though I was a bit slow to pull a drawbridge and it got in massacring the military and entire fortress population of about 150. It's kills included 3 FBs, 2 goblin sieges + 1 dwarf fortress.