Notice the "steam/fog/smoke" thing evident at 6:00 minutes
Notice the glowing orb in the skeleton of unit 4.
also look at this one http://www.youtube.com/watch?v=EtX0A0mjFVA&feature=relmfu
the second one definitely doesn't look like fog to me, and I grew up in the San Francisco bay area and have experienced fog...
Hat tip: Nuckelchen made it and Heart of the Rose posted it.