It would take a long time to find a log snippet and it's not worth it anyway but I will tell you everything I saw from it. It never works in a 1 on 1 fight (I suspected you might get some kind of bonus to parting blow or when they PANIC YOU COULD NOT ESCAPE etc.. Nothing here. The most obvious impact it had was when I was taking the codex solo and after i would kill one member i would get what equated to an extra half-round of attacks on the next member. HOWEVER, these attacks are just like regular attacks and can be parried or dodged. Whenever someone else was raiding with me it would only work sometimes. It doesn't seem to work well in groupfights but only when it's you against a group. I was expecting a lot of 2 on 2 etc with Fort but it didn't seem to help with that. A lot of the time i just did ONE extra attack and that would get dodged by whoever which just made it laughable.
It also seems to trigger on people you don't even want to fight. i.e. fighting a neutral outlander with a goodie outlander in the room that is not assisting nor is grouped with the neutral outlander. When the neutral fled I for some reason started attacking the goodie.
The legacy is just one big clusterfuck of shittiness. Please don't try for my sake.