Groundskeeper Rhoda in more ways than one, and Susan continues to have none of what she's supposed to be expressing in this cutscene.
This is not what happens in Fable 2, but there's a lot in common. In that game, the hero of... Swole? Probably strength, but let's go with swole. The hero of swole isn't happy with their life of pacifism, bad guys show up and do a very bad thing, and she essentially reacts with "yeah, I'm grabbing a giant hammer and seeing all the evils of the world as nails, now".
So not terribly different, really, but I didn't want to just copy that with an air of exaggeration and call it parody.
I wanted to have Rhoda's decision reflect Susan's choices, and have the scene play out in a way that reflects what might happen with a player character who's only technically evil while having done a lot of beneficial things. I like the implication that recruiting Rhoda could have gone very differently, and how it could have played out would have depended on Susan's choices.
Basically, I'm suggesting there are ways one can make choices feel important even if one's got a bit of a railroad plot. Yes, recruiting Rhoda is essential, but there's still a lot that can be done with it.
Well, that, and it was just more fun to write it this way.