[zaga_fan]

^
I heard that as well.

The exact situation is throwing a forward pass BEHIND the LOS to WR, who then throws another forward pass down field. Is that legal or not?

Illegal.

If you're going to throw a pass to a WR who is then going to throw one down the field it has to be a lateral pass.

I've seen a couple of times where a QB has thrown a ball and it got batted at the line of scrimmage and the QB caught it before it hit the ground and tried to throw it again. Both times ended in penalties for an illegal forward pass.

That same situation happened in the pros once as well. If I remember correctly, Brett Favre's first pass was a completion to himself. He also tried to throw it afterwards and got flagged.