If as a police officer you’re not authorized to use a choke hold then it’s an illegal assault.
Period.
If it is illegal it is defined as illegal in the Penal Code.
Not in the Penal Code, not illegal. I would very much like to read the statute that defines what an 'illegal assault' is. That would be good to know. Since you refer to an 'illegal assault' then you much be aware of the Penal Code that defines such an act, that lists the elements of the crime.
No matter how much you wish it to be true, emotions do not define the law—the Penal Code does.
So you are saying if you used that takedown on some guy attacking a loved one, then you acted illegally.
As stated before, not following policy is not the same as breaking the law.
Until you can quote the relevant statute, then your argument is baseless and emotionally based.
Have a nice day and I look forward to reading the statute when you find it and post it.