If somebody had tried to intervene in it, they likely would have been shot and killed, in addition to Floyd still being killed.
The broader media narrative would have been that the police had apprehended a man who was on drugs and/or had been involved in a home robbery when his friends tried to stop them.
The police would have been hailed as heroes and what is basically the right-wing narrative would have become the dominant one instead.
Yeah you could tell watching that awful video - if Floyd had been saved, then nothing happened!! So it's just some people assaulting police for "no reason". If he had died, they would have blamed the people trying to save him for like, distracting them so much they killed him on accident. There's no way out other than purging these fucking people, taking away former cops' gun rights to prevent a fucking friekorps, and completely reinventing public safety