Seems to be bugged for me, got the key and went down to the Hideout, passed the skill checks in the talk with Zarys?
She tells me to come to here, and says she disabled the traps. I gladly wander through the first iron-barred door, walk down the tunnel and promptly we are blown up. Managed to survive and revive the dead ones, had to lockpick the next door,
see lots of oil on the floor, walk a bit further and all firey hell broke loose!

So something is a bit iffy..

Could be because the Gnoll's killed the two in that cave, but never got that as an topic in the conversation..