Nuttin to work out Bat, when you think about it, it's nothing but greasing one in. I just noticed Morphs link is a film. Yeah there are some small instances where they are using smoke, but I see they turn it off quickly too.
Also notice how the first time they touch, they are feeling it out, then they lay it in there. Very nice work. Of course it takes a nice touch, but then so does everything else when flying
