Resumption of Play Issue

[Wellmer]

Let's use NFHS rules for this question. Team A is at the line for two free throws when a timeout is called. The 2nd horn sounds after the timeout is over. Team A is in position to shoot the free throws along with their two players in the second slots of the lane on both sides. However, Team B is not coming out of the huddle and is still on the sideline. Official bounces ball to shooter for 1st shot. In the meantime, the free throwers teammate, in the 2nd slot on the side of the lane, decides to move down to the lower spot since it's unoccupied and gets call for a violation. The officials don't allow the shot and give the ball to Team B. Question : Since the low block was not occupied by any member of Team B, this falls under resumption of play, doesn't it? If the free throw is missed, an alternate shot would be attempted. Furthermore, if Team B doesn't fill the low block for the alternate shot, at this point a Technical foul would be called, correct? Since no person was originally in the low block where Team B was suppose to be, would not the infraction by Team A's player for moving into that spot be ignored? Anyone have a rule # or case play reference. Why the officials did not drag two players from Team B down to the low block positions, I don't know. I would have strongly demanded that they be filled until they were.