Personally, I believe this song is just about a good friendship. Possibly a friendship he didn't know existed. When I first heard the song I had no idea what he meant by the chorus but when I started listening more closely I thought of it as someone sticking up for him. "Tonight you arrested my mind when you came to my defense with a knife in the shape of your mouth..." I just feel like that line means someone he never expected to stuck up for him by using words. I think I explained that as best as I could. Who knows, I could be wrong. It's just the way I interpreted it.
Personally, I believe this song is just about a good friendship. Possibly a friendship he didn't know existed. When I first heard the song I had no idea what he meant by the chorus but when I started listening more closely I thought of it as someone sticking up for him. "Tonight you arrested my mind when you came to my defense with a knife in the shape of your mouth..." I just feel like that line means someone he never expected to stuck up for him by using words. I think I explained that as best as I could. Who knows, I could be wrong. It's just the way I interpreted it.