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Quick Reference
Breakdown
RPO Zone Alert Bubble out of Shotgun Doubles HB Wk pairs an inside zone run with a bubble screen alert to the slot, giving the QB a true dual read at the mesh point. The alert tag means the outside receiver stays vertical or works a hitch while the inside slot receiver sits into the bubble, so the QB is reading the flow of the second level defender (usually a linebacker or slot corner) to decide run or throw. This is a run-first RPO that doubles as a zone beater against light box looks, and it also punishes man coverage if the defense crashes down on the run action.
Defensive Reads
Pre-snap, identify whether the defense is in a two high shell or single high look, since two high shells often leave the slot defender responsible for both run support and the bubble, creating a true conflict defender you can exploit. Watch the alignment of the slot corner or nickel defender, if he is playing tight to the line of scrimmage he is likely crashing on run action, which opens the bubble throw immediately. Man beaters live here against Cover 1 or Cover 3 man variants where the underneath defender bites on the run fake, leaving the bubble receiver uncovered in space. Zone match coverages like Cover 4 or Cover 6 with disciplined linebackers who sit in their run fit without over pursuing will shut this down, since the alert defender stays home and the bubble has no room to develop. User controlled lurk defenders sitting in the shallow zone are the biggest threat to this concept, if you see a user spy the bubble lane pre-snap it is safer to trust the inside zone run instead. Watch for nano blitzes or overload fronts on the play side, since a fast interior blitz can beat the zone blocking scheme before the RPO read even develops.
Usage Tips
Check the box count before the snap and if you see six or more defenders stacked inside the tackles, key the bubble read immediately instead of banging it into the line.
Use your right stick to peek the flow of the alert defender (the slot corner or overhang linebacker) right at the snap, if he crashes on the run you pull and throw the bubble instantly.
This play thrives on second and short or third and short since defenses often sell out on run fits, giving you the free access throw to the bubble.
Pair this with RPO Zone Read Bubble and RPO Power Peek in the same drive to condition the defense to respect both run alerts, then hit them with Double Cross or PA Posts off the same formation once they start crashing hard.
Against defenses that key run fast, hot route the outside receiver on a quick out to add a third answer if the bubble defender sits flat footed.
Do not force the bubble against press man on the slot receiver, that leak of a free hitter is what makes this concept dangerous when overused.
