I figured out the trick for it after loading it 100xs.

Back story is I wanted to give respect. So I had a couple trials in what I could do. Got it to work during watching videos n missed it. Reloaded, walked around it, jumped in it, killed the snakes etc but then I got it.

What you do it once you get of the horse trigger first line. And stand there allowing first line to go. Don’t move n after the first line stay there don’t move. Instead of holding down R3, you have to click press R3 n it will trigger the rest.

I wanted it to make sense so after the first line I wanted to get closer so he can see the cage but that disassembles the quest, just don’t move after he talks first line. All YouTube videos are wrong. They tell you to kill the snakes, or walk around the grave while pressing odins view or jump in etc. naw just stand there n let eivor talk keeps standing there n click press R3 n it will do the final part