IMO early on Team A is very close to being set (all 11 in formation and looking toward the sideline for a play) and when the play is in both #11 and #10 start moving. No question that just prior to the snap and at the snap #11 (slot receiver) and #10 (QB) are both still moving (#11 is moving backward and #10 is moving forward). I'd go with a live ball Illegal Shift foul here.