Áskell, at Gondamon, told you that one of Gellir's company left a brother of his own behind. Sigurdór, the brother left behind, has gone to Kheledúl seeking his own vengeance. Áskell asked that you seek him out as the port has been overrun and it's dockmaster deposed to a tower on the outskirts of the port.
'Though my brother is avenged, I fear that in my sorrow I spoke too plainly to a younger dwarf who now risks his own life to avenge his own brother, a member of Gellir's company.
'The dwarf, Sigurdór, went towards Kheledûl to avenge his brother, but likely is at a tower on the outskirts of the port with the deposed dockmaster, Svanr. Follow the road east beyond Thrasi's cabin, towards the shore, and keep an eye out for Sigurdór.
'I pray you are not too late to stop his folly.'
Sigurdór is at a tower along the road to Kheledúl east of Gondamon.
Áskell directed you to find and stop Sigurdór, a hot-headed young dwarf, from committing a terrible folly.