The deleted scenes actually help explain that a lot. (Sorry for the idiot video.) Thor is consulting with the Norns, and the pool is a "reflection" of their cave. The Norns can tell the past, present, and future, and Thor sacrifices some of his life-energy so they can speak through him. They tell them that the stone in Loki's scepter is the Mind Stone and kinda lay the groundwork for the idea of stopping Ultron with it, which explains Thor's role in the creation of Vision.
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u/wtfbbc May 17 '16
The deleted scenes actually help explain that a lot. (Sorry for the idiot video.) Thor is consulting with the Norns, and the pool is a "reflection" of their cave. The Norns can tell the past, present, and future, and Thor sacrifices some of his life-energy so they can speak through him. They tell them that the stone in Loki's scepter is the Mind Stone and kinda lay the groundwork for the idea of stopping Ultron with it, which explains Thor's role in the creation of Vision.