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Good question and one that my crew of rookies approached me with this past week...
after discussing with my U (27 yr veteran and NCAA R) this is what we came up with...
1) The "assist" by A is generally called only when A is in the act of pulling or carrying the runner. In the case you provide, the action by A usually results in the pile collapsing, therefore A gains no advantage.
2) The block in the back is ignored using the advantage/disadvantage philosophy stated in 1 above.
Other regions may have different views and I would like to hear them...
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Alan Roper
Stand your ground. Don't fire unless fired upon, but if they mean to have a war, let it begin here - CPT John Parker, April 19, 1775, Lexington, Mass
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