Travelling - or not travelling?

[DrC.]

David, I'm not sure what you mean. It sounds like you are describing a fall-away jump shot. I mean if you have the ball and you step back with your non pivot foot and lift your pivot foot as you are releasing the ball its good as long as the pivot foot doesn't touch down before the ball is released (like a reverse drop step).
If your mean he steps back with the non pivot foot and then moves the pivot foot (touches down) then shoots - it is clearly a WALK.