In heavy weight boxing it a fighter absorbs several punches without blocking or responding the fight is stopped.
It was a good fight, Takam is a good fighter though the head butt in the second round seemed intentional.
He couldn’t have gone further. he was being punched by a 115 kg guy who trains on how to punch hard every day. When a fighter starts taking left-right-left-right the fight is over. Another fight with such controversy is Gerald Washington versus Deontay Wilder. The fight was almost draw with only one judge ahead for wilder. A combination took Washington down, he stood and started taking left-right-left-right and the fight was stopped. People complained that Washington was not dazed but in my opinion he was out. The only other thing that could have happened is the fighter getting knocked out cold, which is usually dangerous.
This is why there are weight divisions, defence and controlled fighting in boxing. Ignore these and in a few years you have an unfortunate Congestina Achieng kind of a case.