@jenbanim I did notice that sometimes the ball getting hit by the laser balls didn't matter sometimes, a grace period makes sense.
I did a much quicker replay a few minutes ago and I think the physics are solid. Not sure if it is intentional but I accidently released the ball by hitting z again and when released that ball is immune. I found that tossing the ball in lvl 3 was a bit easier from one side of the sentries to the other or just dropping it to restore better control of momentum.