In my mind, I saw brock was in a bad situation, and I cant remember how long was left in the round, was it 60 seconds? I think brock could have defo survived that round without being knocked clean out. And the ref should have let him finish the 1st round to see how it went in the 2nd round, and then if he was in serious trouble in the 2nd round (like falling down with the first punch from cain with wobbly legs) then yeah stop it. But that 2nd round, brock could have come out, taken cain down, and cain might have never come back up...sometimes fighters need that first round to work out their opponent on the day, and then 2nd round come out of his corner and mix things up and change what needs to be changed if the original gameplan hasnt worked out.
Surely nobody on this planet can say that its not within the realm of possibility that Brock couldnt have come back?