Concerned by the words of Saruman while you were imprisoned within Isengard, you wanted to check on the well-being of Nár and Frithgeir.
'Well, this is a surprise! ${PLAYER}! I did not think to see you again. I thought you would be well on your way through Dunland by now!'
Frithgeir listens with mounting surprise as you tell him that Saruman spoke as if he had killed Nár.
'What lies this Wizard spins! He is like a great, fat spider, weaving webs of treachery and deceit! We have seen no sign of him or of his uruks since you departed. Something must have been keeping him busy. You can speak to Nár yourself, if you like. He is here in the library, as he generally is.'
Nár is in the library at Zudrugund.
You have spoken with Frithgeir and confirmed to yourself that Saruman was lying when he spoke of killing these dwarves.
Frithgeir is in Zudrugund.
You have spoken with Nár, who seems to be fine, as normal as he ever is. You should return to Frithgeir.