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				Originally posted by johnny1784  
If I understand you correctly, the term you are using "ON the back", refers to an "over the back" call on the defender?  If so, there is no such call.  I feel a player can defend over the back as long as the player does not make contact which empede's the opponent to a disadvantage. 
 
Give me some feedback.  Thanks. 
			
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 The word ON implies contact, which is what Nance was saying and why stmaryrams was applauding him. 
To recap:
"ON the back" implies contact
"over the back" does not