UFC world reacts to Leon Edwards' stunning KO kick of Kamaru Usman

Kamaru Usman had this one in the bag.

Until he didn't.

After dominating the bulk of the fight in route to a would-be certain victory on the scorecards, the UFC welterweight champion let his guard down in the final minute of his championship defense against Leon Edwards at UFC 278 on Saturday. That moment was all it took for Usman to lose his crown.

Edwards misdirected Usman with his right hand, then delivered a devastating kick with his left leg to Usman's head that knocked the champion out cold.

Game over. The pound-for-pound champion was no more. And the UFC world went wild.

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Fans at Salt Lake City's Vivint Arena who moments earlier booed the fight over a perceived lack of action collectively jumped to their feet in awe of what they had just witnessed.

Meanwhile fans, fighters, journalists and pundits on social media were just as stunned.

Meanwhile, Usman had his own take alongside a vow to return.