Raedthinn largely just wants to be left alone (he seems to be taking over for the late lamented Koshka in this regard). Buttons, on the other hand, wants to have fun. And part of having fun is play-fighting with other cats… which means sometimes Raedthinn. Raedthinn is perfectly capable of beating the tar out of Buttons; I’ve seen him bodily hurl Buttons halfway across the room (and boy, is that one surprised cat). But mostly he’s pretty inert.
Which just seems to drive Buttons even more buggo.