It depends on the situation for me, to be honest. Well, first of all, I can't say definitely what I'm going to do or not, cause people often say those types of things but then they find themselves in the actual situation and it's all different.
But anyway, if I think I have an actual chance of doing something (like I wouldn't get in an argument between big groups of men or somebody with a gun, which could result in me getting killed, as well as the person I was trying to help), I think I would try to intervene. My self-preservation instinct isn't that strong anyway