Playbooks

Boomerang Y Delay lines up out of Shotgun Doubles HB Wk with both outside receivers pushing vertical seams to stretch the deep zones and occupy the safeties. The Y (TE) runs a delayed release out of the backfield area, sneaking underneath the coverage after selling a blocking look, while the HB works an arrow route to the flat off a boomerang path that clears out from right to left. The single receiver on the line runs a shallow drag underneath, giving the quarterback a layered underneath option, and the QB has a scramble/escape lane built in versus pressure. This is a zone beater at its core, designed to exploit the seam between the linebackers and safeties, with the Y delay as the primary read against zone drops and the HB arrow as the checkdown versus man coverage.
Watch for zone drops from the linebackers immediately after the snap, if they sink deep and ignore the middle of the field the Y delay will sit wide open. Identify single high safety looks pre-snap, this tells you the deep verticals are drawing extra attention and opens up the delay and the drag underneath. Key the flat defender or corner on the HB side, if he stays wide expecting the arrow route you get natural spacing for the delay route behind him. Watch for a nano blitz or edge pressure package, since the delay route needs time to develop this play is vulnerable to quick interior pressure that collapses the pocket before the read opens. Man coverage with underneath lurk defenders can jump the delay route if the linebacker reads the QB's eyes, so double check for a user controlled defender sitting in the throwing lane before committing to that read.
Use this play on second and medium or third and short since the delay route needs a beat to develop and the underneath options are shorter throws.
Check the middle linebacker depth pre-snap because if he sits shallow the Y delay will not have a clean lane and you should bail to the HB arrow instead.
Motion the HB across pre-snap if the defense shows man to confirm coverage and force a linebacker to declare before the snap.
Pair this play with Y Cross or Double Cross from the same set so the defense cannot key on the delay action and starts biting on quick reads elsewhere.
Hot route the backside vertical receiver into a comeback if you see a two high shell sitting deep, this gives you a quick outlet without waiting on the delay to develop.