Rule Question (on screens) and $5 reward

[rockyroad]

Can someone explain to me how the defender - running at full speed - is able to stop at first contact with the screener who they never saw??? Yes contact on a screen can be severe and not be called, but I think Bart's point (sorry if I'm misreading Bart) is that in the play he is describing, there is no way the defender stopped after initial contact, and that's what causes the screener to get creamed...and I'm sorry, but sending a screener into the third row is not incidental contact...