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			1:  screening rules apply.  contact may be severe and still be incidental.  Assuming you have a crash where both players fall, you may need to call the foul; but by rule you would be justified in letting it go. 
2:  guarding rules apply, PC foul on A. 
3.  guarding rules apply, pushing/charging foul on the new defender, A.
		 
		
		
		
		
		
		
			
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