The situation with the intentionally released ball is interesting.
But let me to put it more complex:
1) what if a teammate A2 is touching the A1 ball during A1 jump without release it?
(in street basketballball it may happend when A2 forgot that A1 is teammate...)
2) what if when B1 block A1 by touching the ball, B1 is walking while touching the ball (now you may split the case if B1 was actually causing to double control or not), and then he release the ball (A1 still in the air), is the ball still live?