Primary defender is the player who initially is guarding you...You get past him, defender comes over, he is now considered a secondary defender---Unless the play stops. The difference between jumping(straight up of course) and not is simple: You have to allow a secondary defender a legal chance to guard. As long as he jumps straight up, there is no foul. If he just chooses to stand there, its a foul. Why? Because he'sin the restricted area, as an illegal defender.Hmm, that seems silly them. So we want people to just not play defense as a secondary defender. Why is there a differentiation on jumping or not jumping? So if you stay straight up and leap a couple of inches versus not it impacts whether it is a foul or a play on? How long are you guarding someone before you are the primary defender? Interesting though.
It seems like it would be easier to see on the floor than on TV, especially to a trained pro. Maybe not though.
Regardless, I in no way think UCF got screwed. I think they blew it. I just enjoy talking about Duke getting calls when they get them.
As for being easier to see on the floor, opposed to TV? No way. The view from TV is elevated. We can see the entire floor. As an official, that is not always the case. You have 25 other things to consider as well. Its just not as easy as it looks.