I did read everything in your post but you reference a case where the facts of that case have nothing to do with this case. The decision in that case was based on completely different circumstances and that is the police pepper spraying a restrained person.
You fail to see two things:
1. The officers has a responsibility to recognize that the situation is different because the individual is developmental/mentally impaired and thus treat it as such. You have no information to indicate they didn't! One could say they did by using three pairs of handcuffs instead of one. Is there a thought wih this sentence? It could also be said that they failed to recognize that the aid had the training to help calm the victim down.
You have no idea what was happening when the aid offered assistance. In the case that you cited, it points out that the aid couldn't calm that person down and locked herself in a car. If the police back off and let the aid attempt to deal with a person who is already violent, and that person then gets hurt, the police are responsible.
2. The officers, once arresting the individual (ie detaining him with handcuffs) have an added burden to take care of his welfare. The care was so good the arrested died of homicide (dead caused by another human - not for medical reason which was reported)
The officers did render aid. The individual died at the hospital. That is the officers obligation, to use reasonable force, which in this case there is not any information to this point the officers did anything but use reasonable force. The person dying is not automatically the officers fault.
I contend they failed on both.
I also contend that by touching the individual (the bases for assault under Maryland law) this started his 4th Amend. rights violation. In most minor property crimes and in many cases even simple assault causes, arrests are not made and court appears are only required. If you catch someone trespassing my first guess is you do not grab them to remove them from the property.
Again, you show your ignorance in the law. A misdemeanor committed in the officers presence (you have at least one here, the failure of paying for the ticket and remaining in the place of business.) is grounds for a warrantless arrest. If these officers did nothing, they could be charged with malfeasance of office.
I also contend that since there were 3 officers, the fear of great bodily harm was not an issues.
How do you figure this?
As for the officers, they were on the clock for the movie theater acting as agents for the theater, not the police department. Wrong.
Knowing a little about civil lawsuits, the sheriff office will be a target. Because they are officers, there is a higher expectation that they would have better training to handle such situation that a standard security guard.
It is really hard to argue the outcome based result that the corner reported homicide (dead by another human) and the SC ruling that once arrested (detain in such a way as not free to go) the police have an obligation to protect that person that they fail (detain is dead caused by another human).
I am pretty certain there will be a lawsuit, but that doesn't mean the officers did anything wrong.
I believe that the officers need better training and that message needs to be sent out. I believe the family has been wronged (likely the aid and the theater). I do not think it is criminal murder or even manslaughter. Probably more negligence on the parties involved. It is tragic and sad and all involved I would guess feel badly about it.