I think that I have a clear understanding of what the song means. The song is supposed to mean that he is missing a piece of him and it has just been away from him for a long time (The "missing person" he's talking about). The part when the song changes course seems to be an attempt to locate that missing piece. The line where it mentions "7.1" seems to be a reference to the Richter Scale, the scale used to record earthquakes. This indicates that the event that he experienced that likely took away a piece of him was severe. This could be another song about a breakup, or it could be about major event that reshaped him.
I think that I have a clear understanding of what the song means. The song is supposed to mean that he is missing a piece of him and it has just been away from him for a long time (The "missing person" he's talking about). The part when the song changes course seems to be an attempt to locate that missing piece. The line where it mentions "7.1" seems to be a reference to the Richter Scale, the scale used to record earthquakes. This indicates that the event that he experienced that likely took away a piece of him was severe. This could be another song about a breakup, or it could be about major event that reshaped him.