Coupla' things:
1) Yes, everyone should use the proper PC mechanics (signal foul with closed fist and then signal PC with hand to back of head). I find that this is a terrific method in terms of audience interest. The fans see the crash, then note that the referee has a call to make (signals a foul) and then (finally!) they get to see what the call is. I find that the delay is important (a) to pause for a double whistle, (b) for dramatic effect, and (c) to gives you a split second to make sure you have the right call.
2) Sometimes, you may see an official use FIBA mechanics for PC. ie. the official signals by indicating a foul, then punching the palm of their hand, and then signaling with a fist upcourt. It's a terrific signal for PC (very effective). It's too bad that NCAA does not the same mechanic. Punching the palm is far more interesting and better to sell than planting your hand on the back of your head.
Cheers,
David
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