Being a ref isn’t simple in any sport. There are various methods for judging a match. But in a sport like MMA a ref mistake can be costly.
Here’s an insane video from a Bellator match between a fighter called Chad George and a Mark Vorgeas. George used a Von Flue Choke on his adversary and stifles him out. The ref doesn’t see it however and keeps the battle going.
George tells the ref that Vorgeas is KO’d but even after George gets up and yells over to Ayers “He’s out – Yes he is!”, the official keeps on delaying before at long last making his mind up and proclaiming that the challenge was over.