It's really awkward. They're in a crowded area yet for a moment you can see how to them, no one else in the room exists. I'm not sure if the camera angle was intentional or he was walking around recording and caught the perfect glimpse of them signaling to each other.

Yes and no, your thumb should face out to the person you are blessing, saluting, or cursing. Facing to yourself is "non-occult" used by people to represent rock.