The sideline is very near the spectators leaving little space out of bounds for A1 to make a throw-in. As a result, the administering official has directed B1 to move back a step to give the thrower some room. As soon as the ball is handed or bounced to A1, B1 moves right back to the boundary line in front of A1.
It is a violation by B1 and will also result in a warning for Team B which is reported to the scorer and to the head coach. Any subsequent delay-of-game situation or noncompliance with the verbal order will result in a technical foul charged to Team B.