Is there moving screen in the paint?

[xtreme panda]

Well it unfolded like this:

A1 = shooter
A2 = Me
B1 = Defender

My teammate misses a shot and A2 and B1 go for the rebound. I come down with it and pretty much at the same time A1 gets away from his defender and is wide open right in front of me. I pass him the ball, but he fumbles with the ball before he shoots. During this process A2 is boxing out B1 because he wants to rotate off to defend A1.