Derrick Johnson knew his season was over the moment he hit the frozen turf of Arrowhead Stadium, the Chiefs' veteran linebacker ripping off his helmet in frustration.
It became official when he went to the sideline and found he had torn his Achilles.
The injury only briefly deflated Kansas City on Thursday night, though. The Chiefs' defense seemed to rally around their fallen leader in the second half, shutting down the Oakland Raiders to preserve a 21-13 victory that gave them control of the AFC West.
"He's a guy I respect so much, and just to see the look on his face when it happened, it looked serious," Chiefs quarterback Alex Smith said. "There's...