Múta has tracked down the thief, but there may be more to the situation than meets the eye.
'We'll need to question the thief, and that means keeping him alive. From my observations, the Orc is a bit of a coward, preferring to flee rather than fight.
'How about this: retrieve whatever is left of our supplies in Durshulot, on the middle tier to the east. The ensuing ruckus will flush the Orc out and allow me to corner him. We can meet back here once you're done.
'If things go badly, or if I misjudged the Orc's cowardice, I'll have your back. Good luck.'
In hopes of flushing out the thief, Múta has asked you to retrieve the remaining supplies at Durshulot.
Durshulot sits on the middle tier, east of Gabil-memâg.
You have retrieved the stolen supplies.
You should return to Múta at Gabil-memâg, west of Durshulot.
The Orc seems to be done rambling.
You should talk to Múta and figure out what to do with him.
Múta will return to Aslíf on the upper tier with the Orc as a prisoner.
Náin will be interested to hear what you have to say about what happened.