Pix - going by the guidance from the Police Dept. if he turned up at the scene to find an arrestee resisting violently he would have been within regulations to taser or strike him.
By wrestling him to the ground and using body weight as a restraint he was actually using less force than he could have...
'Nelson also once again put the use of pressure and body weight techniques in a favorable light. The state wants to present Chauvin’s knee in a negative light, as deadly mechanical asphyxiation, or as a “blood choke” as attested to by MMA Williams. In fact, however, the use of pressure and body weight to restrain a suspect was adopted by the MPD because it was a lesser intensity of force than the prior practice of using strikes—either barehanded, or with batons, or even with weighted gloves—to compel compliance. Mercil concurred.
The take home message for the jury is that Chauvin’s knee, far from being a public execution in a public street, was a lesser force than would otherwise have been required.'
As far as I can see unless the prosecution can find a diary with 'Today I am going to kill someone' written on the appropriate date the murder charges are out of the window. I don't fully understand the workings of the US manslaughter so can only say that it may still be a runner - but I doubt it.