Hmm. I remember seeing it a couple times back when it was new (but without the extra footage and other cameras shown in this edit). I don't remember anything significantly different in regards to when the blood appeared. IMO it takes a few seconds for blood to begin squirting from a bullet hole. I think that's because the hole first has to fill up with blood, and after that it can begin squirting/flowing out. Being shot or stabbed in the chest is consistent with how the man died - slumping over basically dead on his feet. It probably got his heart or major artery. Either way, it sucked to see the cops ignore the dying man for quite a while as they milled about the villain's copse. Probably nothing they could have done other than maybe comfort him as he faded away anyhow.
Would his body not have been autopsied? Maybe not in Brazil, but here in Canada most deaths get autopsied unless the death was expected for medical reasons.