loose ball, and screen?

[lpbreeze]

on a loose ball if the offensive team in the frontcourt dives for the loose ball and slides. in my mind he had control of it and slide about five feet and into the backcourt. I wasn't sure if it was backcourt.

on a screen do you have to keep your arms down. in a game I watched a player kept putting both his arms in the air while setting a screen.


just thought of this- in high school ball are you allowed to have your arms up before the ft. I thought no but I keep seeing it including NCAA games. perhaps high school refs let it slide. I've seen refs tell players not to wiggle their fingers up in the air.
If the opposing coach yells out something to his team during the Ft is that a violation- shoot again if its a miss?