What happened: Grice was caught as he intervened following Johnson's finish of Eric McConico. UFC 330 was held Saturday at Xfinity Mobile Arena in Philadelphia.
Why it matters: Accidental contact with an intervening referee raises an officiating-safety concern beyond the result. The knockout also extended Johnson's unbeaten professional start.
By the numbers: Johnson entered UFC 330 at 8-0 with six knockout victories and six first-round finishes.
What to watch: Watch for an update on Grice and any review of the stoppage sequence.