Irrespective of the legal 'niceties' (Seems a rather redundant term in this case) I am stunned that people still do not seem familiar with what was filmed.
The man was walking away from police officers with his hands in his pockets. One of the officers, and not even the one closest to him, approached him from behind and whacked his left leg with a stick. The man carried on walking and the officer then pushed him, resulting in him falling to the ground. At no time did the victim present as threatening or physically aggressive and only one officer seemed to think it necessary to fell the victim.
It is totally obvious to everybody other than a few who seem to think that the police should be above the law, that the police officer in question assaulted the victim without good, or any cause.
In many ways, whether that technically constitutes manslaughter is neither here nor there. It was clearly a vicious and unwarranted assault.
Mull