Knife kicked out of hand.
Key mistake is that the police officer fails to keep a safe distance or at least adopt a defensive posture and bladed stance while close to the suspect. Incident appears to be mental health related.
A power lifter is knocked out by an amateur MMA fighter, falling on a hard surface which resulted in his death. What begins as nothing more than a contest of egos ends with severe consequences.
Gaining top position on the ground creates a significant advantage. It is very difficult to escape or retaliate from there, even with “dirty” tactics. In this instance, the person on the bottom cannot escape so attempts to bite, which only escalates the aggression of the other man who then beats him terribly.
Bystanders choose not to intervene, deciding that the beating is justified. If the man had not announced that the other had bitten him, they may have felt and acted differently. The opinion of bystanders is paramount and they need to be communicated with for this reason.
Despite the victim’s backpedalling and attempt to prevent his opponents getting behind him, one fades to the rear until he is outside the victim’s vision. The victim loses track of this person, which is when the blind side attack occurs.
Victim does not take situation seriously, does not appear to be fearful and stands in a vulnerable position before getting sucker punched and falling on a hard surface. This goes from verbal argument to assault to robbery to manslaughter within seconds.
Victim attempts to stop mugger walking out with his wallet. The criminal beats him horribly.