Halmaera requests that the Vestige tracks down her lost husband and dog.
Talk to Halmaera. Head north towards the barn. Near the barn, the Vestige will have the option to use the dog whistle provided by Halmaera. Pet the dog when he appears. Follow the dog. Talk to Geilund, who is lying wounded on the beach.
The dog looks upset. I should pet it to calm it down.
I found Geilund! I should speak to him.