When and where to run it

Game planOnce the run game has forced the defense to over-commit — it punishes GOOD run defense specifically.
Red zoneBest on 2nd-and-medium after the sweep has been working, and in the red zone where the flat throw is a walk-in.
Game planKeep the quarterback behind the pulling protector and read flat, crosser, deep, then run without stopping the boot.
Game planIf the edge widens, set up inside him; if he crashes, continue outside.
Red zoneIn the red zone, shorten the crosser and send the flat to the pylon while preserving the same fullback and sweep fakes.

Pre-snap to post-snap

Read the defense

Once the run game has forced the defense to over-commit — it punishes GOOD run defense specifically.
If the edge widens, set up inside him; if he crashes, continue outside.
In the red zone, shorten the crosser and send the flat to the pylon while preserving the same fullback and sweep fakes.
That counter-flow is the play's defining misdirection: defenders who run with the buck action leave the boot edge and crossing windows behind them.

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

Troubleshooting

Avoid Waggle before the buck series has made linebackers and the edge defend the run action, or when backside pressure can reach the quarterback before the boot clears.
A disciplined contain player plus a coverage rotation to the boot side can cap all three levels if the run fake has not earned hesitation.
Fakes are softer than they are on the sweep, so the coverage never breaks.
Booting with the sweep fake instead of opposite it — that removes the counter-flow that makes Waggle work.
QB outruns his pulling protector and takes the edge rusher himself.
Young QBs throw the flat late because they watch the rush instead of the flat defender.
Treating it as a dropback pass — the QB has to keep moving toward the boot side.