Brian Callahan stands corrected — unlike the call he failed to challenge. The Titans’ second-year coach acknowledged Monday that he didn’t know the NFL catch rule Sunday when he didn’t throw his red challenge flag in Tennessee’s 20-12 loss at Denver after his rookie receiver made an acrobatic catch but was ruled to have come down out of bounds.

The Titans decided not to challenge a late pass that was incorrectly called incomplete that could have swung the trajectory of Sunday's loss to the Broncos.

The Tennessee Titans’ 20-12 loss to the Denver Broncos was painful enough. But what happened after the game? That’s when things got really ugly for second-year head coach Brian Callahan, who is absolutely on the hot seat this season.