M
Mjölnir
Guest
I think something happens that makes Thor drops Mjolnir. Something emotional, like when someone drops a glass when they hear bad news.
I certainly hope that trailer shot was just an unfinished thing though, as Mjolnir should never bounce.

this one is awesome - "Just calling Mjolnir to me.... PSYCH!"
Love the choke hold scene, you can see by Thor's expression he is going to strike back in a way Ultron might not like..