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Best posts made by W1LL-SN0W
I was able to do the fight but then rolf is stood on a stool half clipping through it with a chat bubble above his head but I can't chat with him, no triangle icon appears, I've tried changing gender, fast travelled away and back again and reloaded a save I'd made just before hand and it keeps happening.
Teleporting too far away (fornburg) resets the mission, will try a few more time and then give up and wait for a patch.
Ha I found my solution these are my steps,
Manual save when you land at Stavanger.
Goto Rolf and start quest.
Fight all 3
If he's bugged out after then fast travel to fornburg and back again, rolf will be back at his quest start position
Start quest again
Fight first 2
As you finish the 2nd fight with little thor stand right in front of rolf who should be seated and spam triangle.
Worked for me
Remember this game is buggy as hell
Save before start any quest and after, before you fast travel and after etc etc means less repeating [censored] lol.