You had no dialogue? Normally Rugan says something like 'Stay out of it, let the heroes risk their life for some stranger" (to Olly), not verbatim but basically he states that they will be out of the fight. Was that missing?
Coming in from the back of the cave you get a completely different dialogue.
Rugan actually hired me to help protect him.
Both Rugen and Olly were actively on my side and taking turns in combat similar to the allies at the gate of the Druid grove.
(I've never come in from the back of the cave before so this is the first time I've encountered that conversation. You have to jump over a big rock and disarm a few trip wires but my whole party was inside the cave before the fight started.)
Olly acted as you would expect he shot his bow on his turn.
Rugen spent his entire turn "planning his next action" and then didn't do anything.
