Having studied the buggers a little I provide the following emperical comments:
...
In the air they go sideways in a peeling action and thus fall away both vertically and horrizontally.
-- Lomapaseo
I see that behavior when I inadvertently sneak up on them from behind and a bit below. They will pull in a wing and go through a tumble.
Sometimes when you clump into a thermal you get the odd dirty look
The avian brain has evolved to deal with other occupants of nearby airspace at similar airspeeds --airliner approach speeds are beyond the design specs.