>>529619141
Yeah, I think Susie may have been actually on point about the Knight lacking power without the Fountain. That's why the Knight got so drastic in response.
I think maybe the Knight isn't able to normally exist/use it's power in the Light World. It only has strength in the Dark. It needs someone else to open the Fountains first, then it can come in and be this unstoppable force.
The first two Fountains could have been opened by other people conspiring with it like Carol, Kris or maybe even Asgore depending on how deep in this he is.