Jump stop vs "up and down"

[docofficial]

Player A1 ends his dribble and jumps off one foot in an apparent attempt to try for a goal. Player B1 jumps to block the try. So A1 does not release the ball and lands on the floor with both feet simultaneously.

What is the ruling here?

Even though everyone in the gym will want a traveling violation. I cannot see why this move is any different from a legal jump stop. Am I right?

Thanks.