How? Not even trying to be combative, but Herb didn't stop the bout until after the bell, so clearly he didn't think he was out in real time.
What, upon replay, determined he was out before the bell? How was that definitive to change the call from the cage?
Herb Dean addresses the controversial ending to Adriano Moraes x Phumi Nkuta and explains the technical submission call:
“[I was] definitely sure that he went unconscious before the bell — like, a fraction of a second before the bell — and then I went and stopped the fight.
He held on for a fraction of a second past the bell... I don’t think it was egregious enough for me to disqualify him.
Each fight is the most important fight of your career, and you have seconds to lock something in. Who knows where his mind was at? He’s fighting for everything, for his whole career, and giving it everything he’s got. Sometimes it takes a second for someone to realize it’s over.”