Pat, I think the fish that you observe is probably feeding. It seems to be focusing on aquatic invertebrates rather than the terrestrial ones that the BG are focused on. By looking down it may be trying to focus at a particular depth with a particular light level. Looking down may limit the light from the dock light ... not sure how that would help but it may help it locate what it's feeding on better. That it ignores the terrestrials on the surface seems to be a behavior thing. Feed training crappie requires a sinking feed. They don't like to feed on the surface.
It was odd to see it standing on its head like that anywhere in the water column. What do you think it was eating? The water is clear with at least 3-4’ vis. This spring there were a few feeding on above water bugs that landed in water
