I watched that awful video ... 7 minutes pass between starting to collapse during the ceremony and leaving the arena on a stretcher, which I read in an article was then wheeled backstage and subsequently, some minutes later, to an ambulance.
Sadly I don't think that time would have made a difference to his chances of survival, but nonetheless it's absolutely appalling that a clearly very unwell person, in a dangerous context and in a place where there should be all emergency services immediately available, needs some ten minutes to be simply laid out and put in an ambulance.
If rather than a brain bleed and then organ failure (that's what I read) the issue was heart related, ten minutes would have absolutely made the difference between life and death or permanent disability.
Safety protocols MUST be improved in boxing, as well as an absolute reduction in rounds IMO. Too much accumulated damage leads to these deaths ... they rarely happen in the early rounds or from one ko punch; usually they come at the end of 10-12 rounds of gruelling fighting.
Last but not least, I read that Santillan had a quick turnaround from a hard decision win in Germany, after which the German commission had issued a no contact ruling until the 30th of July, but his team not only allowed him to return to sparring but booked him in the fatal professional bout elsewhere on the 20th July ... if that's true that is criminal, at least in the moral sense.