Did you see Jameson Williams score an untouched 44-yard touchdown against the Bears on Sunday?

How did that happen?

Williams' score was a long-con by the Lions offense -- a tendency-breaking play they set up over the course of the game.

Let's take a look at a couple of plays from the first half. The first comes with three minutes left in the first quarter.

Amon-Ra St. Brown and Sam LaPorta are lined up next to each other tight to the left side of the formation. LaPorta takes off up and crosses the field on an over route, occupying the middle of the field underneath the defender, while St. Brown snaps his route off into the void created by LaPorta's clearout route.

This is a staple concept and philosophy for the Lions offense: clear out the middle of the field and let Jared Goff rip it.

Goff does just that and sticks the ball right in St. Brown's chest for an easy completion.

Fast forward to the early second quarter, and we'll see the Lions try something similar, this time from the right side of the formation.

St. Brown and Williams line up in an offset stack set to the right side on this third-and-10, with St. Brown again serving as the outside receiver. Williams runs a true vertical clearout route down the seam, keeping the safety high and pulling the underneath defender up the seam to create a 1-on-1 window for St. Brown.

The opening is there, in theory, but Bears cornerback Jaylon Johnson anticipates the dig from St. Brown and undercuts the route. Just a sick play by the defender -- those guys get paid too!

Finally, the Williams touchdown -- the big payoff.

The Lions have spent all game, and really all of the Goff era, conditioning teams to anticipate and break on routes over the middle. On the Williams touchdown, they abuse that to their advantage.

Right before the snap, the Lions motion Kalif Raymond in from the outside to be the new inside receiver, making Williams the outside receiver. Rather than working the middle, however, the Lions run a double post concept: a perfect beater to the Bears' quarters coverage.

Raymond's shallower post route occupies the safety on the hash, keeping him low in coverage. That gives Williams his 1-on-1 with cornerback Nahshon Wright, who, at this point in the game, has to be waiting on a stop route or a dig route to come. Williams instead keeps on trucking right past him and straight into the end zone completely untouched.

Shot plays in the NFL are all about lulling defenses into anticipating the wrong play and hitting them with something else. The Lions layered this concept to Williams on top of not only years worth of tendencies, but a first half's worth of film. That's exactly how you draw it up in the NFL, and the Lions did not waste their opportunity to hit the big one.

How the Lions fooled the Bears on this wide-open Jameson Williams' 44-Yard TD: Watch video