Could this be, yet, another effort to confirm how many angels can dance on the head of a pin?
Considering NFHS 2-35 (RFP) "Ref has signaled the ball may be put in play by a snap..." and NFHS 7-1-7 (False Start) "After the ball is marked ready and before the snap begins, no false start shall be made by any A player (and a reasonable argument can be made the action described violates either/both "a" or "b").
NFHS 7-2-6 advises, "After a huddle or shift all 11 players of A shall come to an absolute stop.....7-2-7 then details the requirements for "motion".
This situation could be perceived as a standard "cluster****", which violates either/both 7-2-6 or 7-1-7, Illegal Shift being a live ball foul and play would continue, wheras False Start, would STOP play. Either/both of which can arguably be considered to put B at an Unfair disadvantage.
Given that choice, stopping the action, for a False Start, which prevents any further complications from arising seems appropriate, and preferable (allowing the angels to dance to their heart's content)