OotS does not try to follow reasonable rules specific tallies on this topic, but I will indulge anyway.
I would expect Belkar to be dishing ~12 damage per hit. He looks like he connected 4 times.
IIRC that bow is a +3 frost burst bow. It might be Mighty (or Haley could have other boosts on her). I would guess d8 + d6 + 4 per hit (~12 damage). Two hits. (Note that she hit 2 of 4 times, which suggests Tarquin is right -- Haley can pinpoint the exact square based on hearing Nale trundle around loudly. Also a 4th iterative attack suggests she might be a 15th level Rogue. Or she is Hasted from a potion.)
The trap looks nasty (long red torso slash marks) and there are two hits. 20 points each maybe?
Total damage: 112?
Based on the fact Nale is not blind, he must be exactly one level higher than Durkon. If Nale has some booster spells up (very likely), I would expect him to have between 120 and 140 HP.