No jackeling here FU,, just saying conscience is one thing ,,consequences in making a mistake are worse. To many "what if's" to make an outright statement one way or the other on this scenario. And I'm just about as far from "Mr Internet Tough Guy" as you can possibly get. After all the discussions we've had in the past, you should know that about me by now. I try to stay pretty level headed.
I must admit though,, if I was in that situation I'd have to know exactly what was happening from the start, before I did anything one way or the other. To be honest, one could get themselves in a world of grief if it was a family dispute going down. I've seen those take on a life of there own,, when it's all about something stupid that don't amount to a hill of beans. If you've been in any form of law enforcement before,,you know what I'm talking about. I've seen some stuff where you'd think 2 people are just about to kill each other,, the next second ,,,,all is well with the world, all "lovey dovey",,,it happens all the time.
Your training should have taught you that,,,