A referee's instructions - whether it's boxing, mixed martial arts or on this occasion kickboxing - couldn't be any clearer: stop the bout immediately when it's clear a fighter is no longer capable of defending himself adequately.
Sometimes it can be hard for the man in the middle to know exactly when to pull the trigger - and at other times it's bleedingly obvious.
Unfortunately for American fighter Casey Greene the referee marshalling his bout against Muay Thai superstar Thongchai Sitsongpeenong at Glory 34 in Denver on the weekend got it badly wrong.
Sitsongpeenong, who was making his highly-anticipated Glory debut after racking up close to 200 fights before the age of 21, nailed Greene with a heavy punch late in the second round, leaving the American staggering around the ring on spaghetti legs.
Greene stumbled and fell to his knees, but returned to his feet on the count of six and after being asked to put his hands up and if he'd like to continue fighting (he said "yes") was offered back up as a sacrifice to the Thai sensation.