Bezab misplaced his helmet, and he fears it might have fallen into the river that runs through Furukzahar.
'I am not in the mood for talking right now, stranger.'
The dwarf sighs heavily and then looks at you more closely.
'Forgive my rudeness. I am just having a bad day. You see, I was being rather cavalier with my favourite helmet, tossing it from one hand to the other, but I was careless and accidentally knocked it over the railing. I heard a splash from below, and it was likely carried out of the fortress by the current. It was my favourite helmet, and now it is gone!
'I suppose it might have caught up against one of the stones of the water channel here in Furukzahar. But that seems unlikely to me. If you can find it and bring it back to me I would be very pleased, stranger. But I am not expecting you to be able to do this. It is probably gone.'
Bezab dropped his favourite helmet over the railing in Furukzahar and it fell into the water channel that runs through the fortress.
You found Bezab's lost helmet beside the water channel that runs through Furukzahar, but it seems a cave-claw found it first.
Bezab is south of the entrance to the throne in Furukzahar, waiting to hear if you found his lost helmet.