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Because 99% of fans, bench personnel, coaches and television announcers are going to be watching the ball, and if you call a foul and signal PC, and there wasn't a defender within 10 feet of the shooter, everyone is going to think you're crazy. That's why a TC signal is useful. It says, "I was watching off-ball, whether you were or not, and there are still rules that apply even away from the ball." Doesn't really seem that difficult to me!
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