Playbooks

Vert Comebacks lines up out of Shotgun Spread Y-Slot Wk with four receivers running vertical stems that break back down into comeback routes at the top of their stem, while the inside slot receiver runs a skinny post/seam up the middle and the running back checks protection with a vertical release up the seam. This is a man beater built to attack cornerbacks playing with outside leverage or trail technique, since the double move nature of the comeback forces defenders to bite on the vertical before the receiver snaps back to the sideline. The primary read progression starts outside with the comeback routes to either side, then works inside to the seam route if the outside comebacks are blanketed by off-man or zone drops.
Watch the cornerback depth pre-snap, since press or tight man coverage is what this comeback concept is designed to exploit with the double move. Post-snap, key the corner's hips: if he opens up and turns to run vertically, the comeback route will create separation as the receiver snaps back downhill. Identify any user-controlled defender lurking underneath the comeback route, since a sharp break by a jumped defender can bait a pick six on the sideline throw. Against zone coverage, look for cornerbacks sinking too deep on the vertical stem, which opens a throwing window for the comeback before the route fully develops. Beware of Cover 2 or Cover 4 shells where safeties can rob the deep comebacks, and beware of blitz packages that get quick pressure before the double move routes break.
Pre-snap, check for single high or two high shells since this play thrives against man coverage with corners playing tight or press outside leverage.
If you see zone drops with linebackers sinking into the vertical stems, work the middle seam route immediately instead of waiting on the comebacks.
Hot route the running back into a check release or flat route on third and long if you need an extra checkdown against exotic blitz packages.
Use this play on second or third and medium to long distance when defenders are more likely to sit in off coverage or trail technique that the comeback route punishes.
Pair this with PA Comebacks or Four Verticals in the same set to keep the defense honest, since both plays sell the vertical push before breaking underneath or continuing deep.