[mbyron]

JR, I don't think 4-44-3 applies, since it is prefaced by "After coming to a stop and establishing a pivot foot," which the player in the OP has NOT done. Therefore the restriction of 4-44-3b, which prevents the shooter from coming down with the ball, does not apply.

So we need to ask whether 4-44-2 applies and he's established a pivot. It seems to me that the OP meets exactly the conditions of 4-44-2a3:
"A player, who catches the ball while moving or dribbling, may stop,
and establish a pivot foot as follows:
a. If both feet are off the floor and the player lands:
3. On one foot, the player may jump off that foot and simultaneously land
on both. Neither foot can be a pivot in this case."

The player in the OP has ended the dribble and landed on one foot. Since the other foot did NOT come down, he has NOT established a pivot. Thus he can go up and come down on both feet (a jump stop), whether or not the reason he went up was for a try.

What am I missing?