I look for B1 displacing the screen and A2 setting a legal screen. On the roll, does A2 do anything illegal to gain an advantage like use his/her hands/arms to seal the defender off by holding the defender off etc.
Often times A2 won't come set on their screen and just roll, sometimes running into B1, not a legal screen. Or as they roll they extend their arm, holding the defender off, illegal.
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