It’s a well-designed play for Dallas. Typically on these red zone/short yardage plays, you have the H-back come across the formation as the pass-catcher, and you fake the handoff to the RB: it looks like split zone. On this play, Dallas gets the same action effect — pulling the defense with hard run action one way; leaking a backfield player out in the other direction — but with jet motion and a RB release.
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Clever design to get to a familiar idea.
As the play runs, however, you see that Jordan Hicks (MLB) does a great job diagnosing the play action and begins bubbling out to gain width on Elliott and Prescott’s action to the field.