Berrio was out cold, but stayed on his feet because he was supported by the corner of the ring. Ideally the referee should have stopped it one punch sooner. Berrio had to be carried back to his corner.
It reminded me of the infamous Emile Griffith fight in 1962 (there's a movie and documentary about it, both called "Ring of Fire") where the referee didn't stop the fight when the other boxer (Benny Paret) was out on his feet in the corner, and he was literally killed in the ring live on national TV (he never woke up and died ten days later). Edited by: JD1986