(CNN) Kansas City Chiefs players had their heads in their hands. Even some Denver Broncos players took a knee as a mark of respect.

Patrick Mahomes' knee "didn't even look like a knee,' according to one teammate, after the NFL's reigning MVP suffered a freak dislocation.

It should have been a night of celebration for the Kansas City Chiefs and Mahomes

On top of a 30-6 win over the Denver Broncos, 24-year-old Mahomes became the youngest player ever to reach 7,500 career passing yards in the first quarter of that victory.

Then a few minutes later, on a seemingly innocuous quarterback run, Mahomes and the Chiefs' evening took a turn for the worst.

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