It shouldn't happen but such a situation where someone becomes hostile can occur even when theoretically everyone's every need is taken care of. It's unfortunate that it did though.

Also, the strangle hold was applied for 5 min. I’m no expert but when someone goes limp from blood flow being blocked, you usually don’t need to continue choking them for an additional 4 min.

That's what the court case was over. Nobody is really disagreeing about the homeless man having been aggressive and a threat and needing to be subdued, it was just about whether the person who subdued him was guilty of "criminally negligent homicide".