While A1 is dribbling in A’s backcourt, the ball legally touches B1’s leg, causing it to bounce away from A1. A1 quickly recovers the ball with two hands and then starts another dribble.
Legal. The touch by B1 ended the original dribble and A1 could then recover and dribble again. However, the touch by B1 did not end team control and the 10-second backcourt count continues.