It cost the Chiefs a victory and led to an uncharacteristic outburst from Patrick Mahomes

Patrick Mahomes already regrets his remarks from Sunday evening – though maybe not the ones you’d primarily expect.

The two-time league MVP went nuclear during and after the Kansas City Chiefs’ 20-17 loss to the Buffalo Bills at Arrowhead Stadium. The pivotal play occurred with 72 seconds remaining in the game, when Mahomes found All-Pro tight end.

Travis Kelce for a completion up the seam − Kelce subsequently tossing a sublime lateral toward the sideline that receiver Kadarius Toney caught and took the rest away for an apparent go-ahead touchdown that covered 49 yards in sum.

Except it didn’t count, officials throwing a relatively rare offsides flag on Toney, who was clearly lined up well into the neutral zone.

Mahomes barked at referee Carl Cheffers and his crew for the duration of the possession − which ended without points three snaps later – then had to be restrained by his offensive linemen on the sideline as the clock expired.

Mahomes, also a two-time Super Bowl MVP who’s trying to lead K.C. to an eighth consecutive AFC West crown and potentially a sixth straight trip in the conference title game, continued an expletive-laden rant afterward and bemoaned the call to his friend, Bills quarterback Josh Allen, as they met near midfield.

Allen, who’d just engineered the biggest victory of Buffalo’s season, didn’t appear to say anything but listened and gave Mahomes a pat on the chest before they parted ways.