Duo

Watch linebacker depth before the snap, since stacked or crept up linebackers signal a run blitz that can beat the double teams before they climb to the second level. Identify single high versus two high safety shells, as Duo thrives against single high fronts with softer box counts but struggles against two high looks that add a extra run defender near the line. Key the play side defensive tackle alignment, since a shaded nose or three technique can disrupt the double team timing and blow up the natural running lane. Track user linebackers flowing downhill immediately after the snap, since aggressive user fills can be exploited if the runner presses the line and cuts back opposite the flow. Look for edge defenders squeezing hard off the bunch side, since this often opens a cutback lane behind the double team push that the runner can exploit with one cut discipline.