I don't know about jail/prison guards but for cops the official standard for shooting some one who is running away is something like "reasonable belief that you

I don't know about jail/prison guards but for cops the official standard for shooting some one who is running away is something like "reasonable belief that you are a danger to the community", "reasonable" might not be the specific standard but regardless it's pretty trivial for an attorney to argue that a guard believed (in the moment, and they only have to believe in the moment) they were justified. edit: here we go https://en.wikipedia.org/wiki/Tennessee_v._Garner https://en.wikipedia.org/wiki/Tennessee_v._Garner "the officer has probable cause to believe that the suspect poses a significant threat of death or serious physical injury to the officer or others." that is of course for a suspect. If you've been convicted the standards are probably much lower.