AP Photo Chicago quarterback Mitchell Trubisky (10) gets up from the field against the Kansas City Chiefs in the second half Sunday.

CHICAGO (AP) — Chicago Bears coach Matt Nagy got a chance to face his former boss Sunday night.

It turns out Andy Reid had a few more lessons for his longtime assistant.

Nagy and Reid watched as Chicago stumbled on offense and Patrick Mahomes accounted for three touchdowns, leading Kansas City to a 26-3 victory that kept the AFC West champions in contention for a first-round playoff bye.

It was the most lopsided loss of Nagy’s coaching 31-game coaching career.

Mahomes helped the Chiefs (11-4) to a 17-0 first-half lead when he scrambled 12 yards for a TD and found Travis Kelce for a 6-yard touchdown. Mahomes, who also threw a 14-yard TD pass to Damien Williams in the third quarter, was 23 of 33 for 251 yards.

The two coaches talked at midfield before the game. Nagy worked under Reid in Philadelphia starting in 2010 and then in Kansas City before taking over the Bears before last season.

“When the whistle blows and your competitive juices get flowing, it’s normal just like every other game,” Nagy said. “I think it’s more so right before the game and you look across and you see everybody you know over there and you see Coach, and then after the game.

“We’re both going there to win and you know that his guys are going to be prepared and do well and that’s what they did tonight. They’re a great football team and they’re well-coached.”

Nagy directed Chicago to a 12-4 record and the NFC North title in his first year in charge.

“I’m proud of Matt and the job he’s done with this team,” Reid said. “It’s a process. He is going about it doing it the right way. Unfortunate he’s been playing with some injuries and that has cost him a little bit. Other than that, he’s doing a nice job.”

The offense has struggled near the bottom of the NFL rankings, weighed down by Mitchell Trubisky’s inconsistent play. The Bears finish next week at Minnesota.

“We just didn’t play our game today,” Trubisky said. “They came to play. We didn’t. We got behind early. You just can’t play catch-up against a team like that. You can’t play sloppy either.”