Originally Posted by Godzilla2000
I just thought of this, but maybe what they're filming is Thor's first battle with Malekith in the movie and he gets his butt handed to him by Malekith's magic and Odin intervenes by teleporting down from Asgard. I could be wrong, but Odin in full battle gear laying the smackdown on Malekth with his own high degree of magic mastery would be pretty awesome.
This. I'm picturing an epic sweeping battlefield sequence (similar to the one in The Avengers), with Odin taking on Malekith while Thor battles Kurse (or vice versa), while Heimdall, Sif, the Warriors Three and other Asgard warriors are taking down a smorgasbord of Dark Elves and Maruanders