Behind does not matter.
Contact behind or "on the back" is no different than any other part of the body. That is why "over the back" does not really exsist. There always must be contact that displaces or puts a player at some kind of disadvantage. You just cannot be behind someone and fouls should be called.
Peace
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Let us get into "Good Trouble."
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Charles Michael “Mick” Chambers (1947-2010)
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