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Quick Reference
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Breakdown
Flat Y Leak out of Singleback Bunch X Nasty sends the Y (leak defender) releasing late off the line into the flat while the two other bunch receivers work a stacked vertical package, one climbing straight upfield to a corner route and the other running a shorter out breaking to the sideline. The single receiver on the backside runs a flat route as a checkdown or built in half field concept. This is a levels type man and zone beater that stresses the flat defender and curl/flat player with the leak concept while the vertical route occupies the corner or safety over the top, and the primary read progression starts with the leak route in the flat, moves to the shallow out, then climbs to the deep corner if the defense sinks its underneath zone.
Defensive Reads
Watch the linebacker depth at the snap: if the underneath defender near the bunch sits shallow and flat footed, he is likely spying the leak route and will undercut the throw. Identify press man coverage on the bunch receivers pre-snap, since this concept struggles against physical jams that disrupt the release timing on the leak and out routes. Post-snap, track the flat or curl/flat zone defender's first two steps: hard commitment to the shallow out route opens the leak route behind him. Look for Cover 2 corners squatting on the shorter routes, since that alignment invites the corner route over the top to be the primary answer instead of the leak. Be alert for a linebacker blitz off the edge, since this play's protection can be vulnerable to a nano blitz look if the offense does not slide protection toward the bunch side.
Usage Tips
Use pre-snap motion or a quick alignment check to see if the defense rotates a linebacker or safety over the bunch, since heavy bunch coverage rotation tells you man is likely and the leak route will be wide open against late reacting linebackers.
Against zone shells like Cover 3 or Cover 4, key the flat defender: if he sinks with the shallow out, the leak route sits in the void behind him for an easy pitch and catch.
Hot route the backside flat receiver into a quick slant or drag if you see a hard blitz look, giving your quarterback a rhythm throw before the protection breaks down.
Pair this play with Flat Y Seam and Mtn Flat Y Leak in the same set to keep defenders guessing on whether the leak defender is releasing to the flat or working a seam, forcing linebackers to hesitate on their run fits.
Best called on second and short to second and medium, since the quick developing flat and out combo lets you stay ahead of the sticks without needing a home run shot.
