1. I believe this is legal. What's illegal about it? I've seen it done in varsity games before. (Not that that means it's right.
) Unless maybe we're reading it two different ways.
2. If I ever get stuck in the middle of a play, I just stop. I may screen a player once that way, but I'm surely not going to screen him the entire way down the court that way. Then, if your partner is paying attention as he should be, he might run the entire length of the floor for you and become the lead at that end also if he can get down there faster for a read on the play.
But just stop. Because it's like the times when you see someone coming down the hallway and you're like you go left, then they go right. Then you step to the left, then they do at the same time. Avoid that. I just stop.