Unusual high school play

[jmdjr9866]

Looking for a rules interpretation for the following play. Team A is taking the ball out under Team B's basket after Team B scored. Team A uses the play where a second player jumps out of bounds and takes a pass from a player that's already out of bounds. As the pass arrives, the player fumbles it and then kicks it (accidentally) off the back wall of the gym and it ricochets back on to the court. A player from Team B picks it up and makes a layup. Is this a good basket or should Team B get the ball out of bounds?