What's your philosophy on a push from behind on an airborne(layup) shooter?

[Nevadaref]

Are we talking a shove directly in the back with no attempt to make a play on the ball? If so, that's an intentional personal foul. It's straight out of the rules book.

If the defender is trying to block the shot or actually play defense and just happens to foul from behind, then a regular personal foul should be assessed.