The quest told me to defeat Morn Shadowbrew, after that i had to collect hot water to remove the ice from Vanir. After I removed the ice i accidentally went backwards and went out of the town hall. When I came back i couldn't see Vanir Stormroarer.
So now I can't progress through Wintertusk because of this bug. Is there a solution to this? I've tried changing realms and re-logging but still no luck.