Kevin Lee’s first UFC main-event victory was marred by controversy at UFC Fight Night 112, which took place at Chesapeake Energy Arena in Oklahoma City, Okla., and aired on FS1 following prelims on FS2 and UFC Fight Pass.

Lee (16-2 MMA, 9-2 UFC) recorded his fifth consecutive victory in the lightweight division when he beat “The Ultimate Fighter 15” winner Michael Chiesa (14-3 MMA, 7-3 UFC) by second-round submission. The stoppage, however, came prematurely when referee Mario Yamasaki stopped the action before Chiesa tapped or went unconscious.

Check below for the top Twitter reactions to Chiesa’s victory over Lee in the UFC Fight Night 112 main event.

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For complete coverage of UFC Fight Night 112, check out the UFC Events section of the site.