DENVER — Sure, the Kansas City Chiefs have seen Patrick Mahomes go with a left-handed pass … in practice.

But in a game? With Von Miller about to sack him, trailing by three points late, 76,656 fans screaming and millions watching on ESPN?

“We’ve seen it in practice,” Chiefs coach Andy Reid said. “Not under those conditions before.”

Mahomes wasn’t as dominant as he was in his first three games. It really doesn’t matter because all we’re going to remember from Monday night is Mahomes sprinting to his left and throwing a short first-down pass with his left hand to Tyreek Hill. That unbelievable play kept a game-winning drive going, and the Chiefs moved to 4-0 with a 27-23 victory.

“When it came out of his hand, I went, ‘Oh wow,'” fullback Anthony Sherman said. “At this point I think we should just trust him.”

Quarterback Patrick Mahomes (15) led a big fourth-quarter comeback for the 4-0 Chiefs. (AP) More

Mahomes has started just five games in his NFL career, but it seems like he has many years worth of highlights. We can add a fantastic fourth-quarter comeback on Monday night in Denver to the list, and of course, the left-handed pass.

“Nobody in history has ever seen that,” Chiefs safety Eric Murray said. “C’mon now. Nobody.”

Patrick Mahomes on lefty pass: ‘I knew we needed the first down’

The Broncos blitzed Mahomes a lot on Monday night. After seeing him throw for 13 touchdowns and no interceptions through three games, Denver emptied its playbook with all the exotic blitzes it could come up with. On third-and-5, leading 23-20 with 3:14 left, Denver dialed up an overload blitz to Mahomes’ right.

It worked because Mahomes had to sprint left. He had no options. And just before Miller tripped him up, Mahomes switched hands and pushed the ball out to Hill for a 6-yard gain. It’s not like Mahomes was planning to switch hands at any point as he was running for his life. It just happened.

“I didn’t think [about] it at all,” Mahomes said. “I was just scrambling left, I felt Von on my back and I knew I couldn’t throw it with my right hand. I knew we needed the first down and so I kind of just like shot-putted it to Tyreek.”

Mahomes has proven already that he’s precocious as a pocket passer. He was supposed to be raw coming out of Texas Tech, but after sitting and learning most of last season he plays like a longtime veteran. So don’t look at the highlight-reel plays or the improvisation and miscast him. He’s the best quarterback in the NFL through four games this season because he’s already a pocket technician with the supreme physical talent to execute Reid’s offense.

But he also has that rare, fun ability to make something out of nothing, even if it’s instinctually going to his left hand when a play needed to be made.

“It was a cool deal,” Mahomes said.

Mahomes had other amazing plays

Mahomes had just 65 passing yards at halftime. The Broncos threw everything at him and it worked, for a while at least.

Mahomes isn’t going to break a long run very often — “I’m not fast, and I know my strength is not running the ball,” Mahomes said afterward — but he’s athletic enough to avoid the rush and keep plays alive. The Broncos have a good pass rush, sent extra rushers at Mahomes often, and they still sacked him just once.

“He made us cover for a long time. I had to go inside and get an IV,” Broncos cornerback Chris Harris Jr. said. “We couldn’t sack this man. He’s a hell of a player, he’s a hell of a quarterback.”

Many times Mahomes had to get creative because the rush was coming. Once he broke outside for an 8-yard touchdown run. On a third-quarter play he was running left, twisted his body and remarkably threw a fastball back to the middle of the field to Travis Kelce for 23 yards.

“No, [the coaches] never encourage that,” Mahomes said with a grin. “At the same time, as long as you complete it and get the first down, they’re fine with that.”