right after Squally got facemasked. 

Critchlow checks the defense. Pre-snap read, sees the safety, recognizes  Shumway is in single coverage on his far right.

calls an audible.

Play action left with Squally.

Turns and rolls right a couple of steps.

Throws a 16 yard out route to Shumway who is working against single coverage from the cornerback

The ball arrives in perfect timing on the numbers and in stride as Shumway is going out of bounds

UNLVs corner is 4 yards from his assignment

very few DBs in college would have a chance to make a play on the ball when the route and timing of the throw are that tight.

we talk about going through progressions while in the pocket but the ability to see the defense before the play starts, and to change the play to a simple looking timing route is bread-and-butter stuff that makes the pro-style offense run like clockwork.