Summer Ball - all this fun and I get paid too?

[Nevadaref]

Originally Posted by Camron Rust

A4 would run up and set a screen on the left side of B1 who was more or less stationary (such that it would have probably been a foul if A1 had brought his defender into him at that moment)

Please clarify this.
From this description, it seems that B1 is a stationary defender requiring no time or distance for a screen from the side, NOT from the back.
If the screener comes to a stop prior to the contact, I don't understand why you state that this would be a foul according to the rules.