Can someone differentiate between a legal and illegal pick in football. It's a really crafty move, which almost guarantees an open receiver. Typically you have a pair of receivers that cross paths, and one receiver will look to block or impede the pathway of the defender covering the other receiver. Hunter Renfrow, of course, had a lot of space to catch that 2-yard touchdown because of the screen. Sometimes they call an illegal screen, sometimes they don't. I'm pretty sure the ball has to go pass the line of scrimmage, which it did in the case of Clemson. But do officials also have to judge the intent of the receiver - as in, was the screen intentional or accidental? Anyone care to elaborate? Seems like Notre Dame got flagged for a pick play in 2014 against FSU in a very similar setting.