QB Under Center then Backs Out to Get Play

[golfdesigner]

NFHS Rules:
I'm sitting here watching some game films from last season in preparation for this season. I know there is a POE on illegal shifts involving the QB. I'd like to see comments on two situations:
Sit A: QB takes a step forward to go under center; a back immediately goes in motion before the QB has been set for a full second; do you have anything here?; and,
Sit B: Offense comes to LOS, O-Line goes to 3-point stance; QB goes up under center and places hands under center, after short pause, he pulls out and the QB takes a couple of steps toward sideline to "get play from O-coordinator" and both backs turn and look maybe take a step toward sidelines to "peer" at the O-coordinator; they get the play, turn back and get into their set position; QB returns under center, puts hands under center then takes snap. My question here is related to QB first going under center, placing his hands under center, then pulling out to "get the play". Do you got anything here or would this be picking nits?