Hard foul, intentional, flagrant ? (HS)

[Kansas Ref]

This play is your garden variety "hard fall with contact" which was caused by the downward counter-force of the defender's blocked shot action on an airborne shooter. We see such defensive plays on a regular basis; I saw no rationale for upgrading to an IF. Also, now, in other instances there is a "hard fall" and no contact on airborne shooter is even made---I have seen this occur when shooters try to make fairly acrobatic moves in the air and fall down hard after the counter-force of the block--I had "nothing" in such cases--despite a body splayed on the floor.