When and where to run it

PressureCall it when the defense gives the slot a numbers or leverage advantage, especially against pressure or a soft apex defender.
Game planThe ball should be out immediately into open space.
Game planUse only where forward catches behind the line are legal; supporting blocks also require league permission.
Defensive lookUse fast motion or a stack to uncover the bubble against press.
Game planIn no-block flag rules, have the outside receiver occupy the corner with a short hitch instead of modeling an illegal stalk block.
Game planOn a compressed field, shorten the receiver split so the bubble still has room to arc outside.

Pre-snap to post-snap

Read the defense

Call it when the defense gives the slot a numbers or leverage advantage, especially against pressure or a soft apex defender.
In no-block flag rules, have the outside receiver occupy the corner with a short hitch instead of modeling an illegal stalk block.
In non-contact flag, supporting receivers run legitimate routes and must not obstruct defenders.
Backside receivers clear coverage.

Cover 0: Anything that develops slowly — pressure gets home first Better answers: Four Verticals, Mesh, Slant-Flat, Smash

Troubleshooting

Avoid it against press leverage that can collision the bubble target or when the defense has more perimeter defenders than available receivers.
It is a quick numbers throw, not a slow-developing route concept.
The receiver runs forward before widening; the bubble must retreat first so the throw stays clean behind the line.
The quarterback holds the ball instead of catching and throwing immediately.
The outside receiver releases vertically without accounting for the corner, leaving the bubble target one-on-one at the catch point.