Backcourt or not

[Kansas Ref]

I've seen more casesof "jump ball" tosses with something erroneus occuring than I thought I would. Cases when both players jump to tap ball, but other player grabbing the tapped ball before it hits the floor after a simultaneous tap effort.
Jumpers "stealing" the jump ball.
And dare I say here---non-jumping players continually moving around and shuffling prior to the tap