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PA Slide is a play-action pass out of Shotgun Flex Y Off Wk that sells the run fake before flooding one side with three distinct route levels. The backside receiver runs a deep dig breaking away from the play, the outside receiver on the play-action side pushes a deep comeback toward the sideline, and the TE and HB work an angle/flat combo underneath, giving you a low-to-high read stacked on top of a wide-field horizontal stretch. The red route shows the play-action fake blocking wide, holding the edge defender and selling run action to freeze linebackers. Primary read progression starts with the shallow angle route out of the backfield against man coverage, then climbs to the deep comeback if the corner sits, and finally works back to the deep dig if the defense rolls coverage toward the flood side.
Key the linebackers immediately after the snap: if they step up hard on the run fake, the angle route out of the backfield will be wide open in the vacated middle of the field. Watch the flood-side cornerback's depth before the snap, if he is playing tight man coverage with no help over the top, the deep comeback should win outside leverage quickly. Identify single-high versus two-high safety alignment pre-snap, single-high shells are more vulnerable to the comeback and dig combo while two-high shells force you to live underneath with the angle route. Look for a user-controlled defender sitting in the shallow flat or spying the backfield, since that lurk threat can jump the angle route and blow up your first read. Beware of a delayed blitz off the edge on the play-action side, since the red route blocker on that side is holding the edge and can get beat by a fast defensive end crashing before the fake fully develops.
Run this on early downs or in run-heavy personnel situations where linebackers are conditioned to bite on the play fake, since the PA hold is what opens up the underneath angle route. Check pre-snap for single-high shells like Cover 3 or Cover 1, since the comeback route on the flood side has a great chance to win against a corner playing off with outside leverage. If you see two deep safeties (Cover 2 or Cover 4), prioritize the angle route out of the backfield since it attacks the space vacated by linebackers stepping up on the fake. Hot route the backside dig receiver into a hitch or curl if you diagnose zone coverage rolling hard to the flood side, so you always have an answer if the defense overloads that half of the field. Pair this with Curls or Double Slants earlier in a drive to establish the quick-game passing rhythm, then dial up PA Slide once linebackers start sitting on those short routes, letting the play fake and deep comeback punish overaggressive run fits.