According to the Chiefs beat writer for The Athletic:
With less than a minute remaining, the Falcons faced a fourth-and-inches from the Chiefs’ 13-yard line. The Falcons lined up in a condensed formation featuring two tight ends and two running backs, similar to one they used in the second quarter to score a 1-yard touchdown. Before getting under backup center Ryan Neuzil, Cousin used a signal, using his hands to tap his helmet multiple times, to communicate with his teammates.
“They saw us all kind of loading the box and they said, ‘Check, check,’” linebacker Leo Chenal said. “We knew that they were alerting to an outside run. (Linebacker) Nick (Bolton) just read it perfectly and took the shot.”
Bolton, who suffered a lower back injury earlier in the fourth quarter, was the lone defender the Falcons didn’t block. He sprinted upfield behind Chenal, who created penetration against left tackle Jack Matthews and tackled running back Bijan Robinson behind the line of scrimmage for a 3-yard loss.“I saw that and cheated over a little bit,” Bolton said of the Falcons’ formation. “It’s a rule around the locker room: If a tight end is (supposed to block No.) 54, man, he’s going to set the edge for you. I saw Leo set the edge and I went off his butt and I made a play. I trusted the play call we had and I already knew where I was going on the snap.”