No interference on off ball play

/ Interferences, No Call
Correct Call: Both players are contacting each other, the white player seems to fall down on his own, or with very little contact. No call.
For this to be a penalty: There should be more aggressive contact made from the red player.
Game Level:This should be called at every level.

Players run into each other, but who caused it?

/ Interferences
Correct Call: Interference. 30 second technical foul. At first glance it looks like the two white players run into each other. But on second look, the blue defender pushes the white player into the other white player.
For this not to be a penalty: If there was no collision and no interruption in their off ball movement there would be no penalty.
Game Level:This should be called at all levels.