This would depend upon the values and goals of the friend, we would need to negotiate between the two of us what their preferred outcome would be. The hard fact is that I cannot presume that any of those other participants should be subject to my notions about safety, security, or sanctity of human life. Because then, in trying to help, I would be subjecting them to my values which would seem “obvious” to me. You defined most of that scenario in terms of what they might “want”, but wants are not very substantial concepts. For instance, if the want to stay with a chronic abuser and have no-one get hurt, then their wants are in conflict and they will almost certainly be disappointed in one way or another.
You might also be drawing a false equivalence between what could be assumed about or learned from one such scenario, and another. A situation being exploitive and/or abusive is still dependant upon the actual participants, and should perhaps not be stereotyped as functionally identical - any more than healthy relationships would be identical.
I suppose I would try to get them to prioritize. Are any of the participants more important than the others? Personally, I would favor the safety and survival of the innocents far more than that of the abuser. Do they prefer for the abuse to stop at any cost? Or is survival more important? How about freedom? If everybody survives and is safe, but the abuser is tied to a chair indefinitely, this might be the maximal safety arrangement - but still a less acceptable option.
Security and safety are not absolutes, they are ideals which are going to be realized to different extents in different situations. Leveraging these ideals against raw emotional motives such as wants and sentiments is anything but clear.
But this whole scenario is framed in an uncomfortably authoritarian context, where you are framing me as impinging upon other people’s relationship. My angle here is how participants formally negotiate and create the boundaries which comprise their social relationships. The primary values, goals, and choices are those of the participants. And if some of them chose to involve me, then we would negotiate what that relationship involved. The best way to help a person is to recognize their agency, and encourage others in the situation to do likewise.
As regards domestic abuse, I think it is an important area, and affects many people. But I still don’t understand how you are relating it to systems of measuring or hoarding “wealth”. To generalize it, we’d need a lot of assumptions about people and thus stereotype them instead of treating them like distinct individuals or groups.
Is there somebody in your life with a gun who threatens you when you measure wealth in certain ways?