UFC Fight Night: See Beneil Dariush’s incredible spinning backfist KO

This was vicious.

Fight week for UFC lightweight Beneil Dariush got off to a bad start in Las Vegas, as he missed weight for his bout against Scott Holtzman, which forced him to forfeit 20 percent of his purse, and also took him out of the running for a potential $50k fight of the night bonus.

Sure enough, in the first fight on the main card on Saturday, Dariush delivered a jaw-dropping spinning backfist KO that had his colleagues calling for Dana White to give him the bonus anyway.

Late in the first round, Dariush punished Holtzman with a series of hard shots, then backed away and caught him with a vicious backfist.

UFC fighters were blown away.