Board Thread:General Discussion/@comment-11588183-20150501071246/@comment-733050-20150503221531

What they're suggesting is that when Thor returns to Asgard, Ragnarok has taken place and so he uses the Time Stone to uncover what happened and stop it. It sounds like a natural way to rewind chronologically so we can actually see how Loki bumped off Odin, and everything's cooler with time travel. The Norns, with their ability to see the final destiny of the gods (one translation of Ragnarok), could figure into this.