I work in a prison. I'm not an officer and have minimal (barely any) contact with the prisoners. Also don't carry protective equipment or have the specialist training in restraint that officers have. I wouldn't know what to do in a fight.
Talking to my colleagues, who are also not officers and the same rank/position as me, they are all saying that if they saw a colleague being assaulted, that they'd dive in and start fighting for the colleague. I've said that without equipment and training, I'm not doing that but I'll call for help on my radio (which we all carry). I'd be a liability in a fight with a violent man (male prison), and it would just result in me getting hurt as well as my colleague. It wouldn't help anyone.
I'm now being told I'm a coward.
Fwiw, I've spoken to the prisoners and have actually got on well with them, on the rare occasions I've been in contact, so they don't scare me. But I know what they're capable of. And the colleagues saying that they'd wade into a fight have all been females, so I have my doubts that they'd be effective against an angry, violent man (unlike female officers, who have training and carry defensive equipment).
I'd never not call for help, but I don't like being called a coward for recognising my limitations and getting others better trained and equipped to deal with dangerous situations. We have protocols and emergency procedures for such events, including fast response officers, who are designated to be first on scene, and panic buttons to summon them.