Playbooks

Bear is the defensive counterpart inside the 3-4 formation family, and it plays nothing like the standard 3-4 Odd or 3-4 Over looks. The alignment shifts to a Base 5-2 front with the NT anchored directly over the center and both defensive ends squeezed down onto the guards, leaving only two linebackers stacked behind the line. That five man front takes away every interior run gap before the snap, which is why Bear shows up as a short yardage and goal line answer inside a formation that otherwise leans on two gapping and delayed pressure.
The tradeoff is coverage math. With five down and two linebackers, you are asking four defensive backs to handle everything behind the front, so Bear does not have the extra hook dropper that 3-4 Odd or 3-4 Solo gives you. That makes the zone shells in this set (Cover 2 Invert, Cover 3, Cover 3 Hard Flat, Cover 2 Invert Hard Flat, Trio Sky Zone) more about squeezing the box and forcing the ball outside than about flooding the middle. Cover 2 Invert in particular drops safeties into the flats and rolls corners over the top, which is a clean look against sideline comeback and out route spam once you user the deep half.
Where Bear really earns its snaps is the man and pressure package. Sam Mike 1, Will Sam 1, Cover 1 Hole, and LB Blitz 0 all let you attack an offense that is expecting a run stuffing front. Sam Mike 1 and Will Sam 1 send the two linebackers off the edge while the five man front already occupies every interior blocker, meaning the offense has zero free bodies to pick up the extra rushers. Cover 1 Hole gives you a robber underneath to sit on drags and shallow crossers, and LB Blitz 0 is the all out gamble that gets home before the offense can slide protection.
Bring Bear out on third and short, fourth and short, and goal line snaps where the offense is likely running inside zone or QB sneak, since the NT over center kills the A gap immediately.
Mix Sam Mike 1 and Will Sam 1 so opponents cannot guess which side the pressure comes from, and pinch or spread your line pre snap to change the rush lanes without changing the coverage shell.
Use Cover 2 Invert Hard Flat when the offense is spamming flats, drags, and out routes near the sideline, then user the deep middle to bracket the seam your two linebackers cannot reach.
If the offense goes empty or trips out of a Bear look, get out of the 1 high man calls and check to Cover 3 or Trio Sky Zone so you are not asking a linebacker to run with a slot receiver.
Save LB Blitz 0 for obvious pass situations where the offense has already shown a slide protection you can beat, and user a corner or safety to jump the first read since you have no deep help.