I believe the issue with a block in the back is one of two things. Most importantly is a safety issue. All the players in the "moving pile" are basically defenseless. To me, this should be flagged for this reason alone. Secondly wouldbe if the blocking A player dislodges a player of B and the runner is able to continue moving forward, this would be an advantage gained.
I agree that assisting the runner might be a "stretch" of the rule, but at the same time the rule (NFHS) does state that the runner may not be pushed. If the blocking A player hits (pushes) the runner and he goes forward, especially if the line to gain is passed, there is also an advantage gained.
Again, I am more of the opinion that blocking in the back is the predominate candidate for a flag in htis situation.
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