Travel call for hand off?

[Jim Henry]

In middle school game I had this happen and coach questioned the play.
Team A in possession in front court. A1 standing with ball. A2 runs by and takes ball from A1 and scores. Opposing coach says that both players were in possession of ball at same time and since A2 was moving it is a travel. She says no different then if A1 and A2 simultaneously get rebound and hold ball and feet move. My answer was it was a hand off and OK. But actually A1 never released. She just stood there with ball in hands and teammate took it. NOTE: It was a set play. Please advise.