I think that he's trying to confess something in this song, like he had something to do with the downfall of "her." He refers to himself as being a "ghost at the scene" which implies that he knew "he" was going to try and bring her down. When he says "I was there at the scene" kinda says that he was there when it happened, and that his hands "smelled like gasoline" implies that he feels like it was his fault, like he figuratively started the fire that led to her downfall. He says that the "headlights murdered my thoughts," suggesting that he saw it happen, but was frozen and couldn't do anything, kind of like a deer in the headlights. The "ghost that remains" is his guilt of feeling that it was his fault. The pre-chorus, I believe, is suggsting that she was innocent and didn't deserve whatever happened to her. In the chorus, he is really just expressing the guilt that is tearing him apart. He wants his "casket closed" so that no one has to look at him, and "your heart beats under the floor" is most likely a reference to Edgar Allan Poes' poem "The Tell-Tale Heart" in which the narrator kills an old man and buries him under the floors of his house. He narrator, in his mind, hears the beating of the old man's heart and it serves as a constant reminder of what he had done, until he confessed to it. When he says "nothing's as it seems" he is recognizing the fact that his guilt is just an imagination. The verse that begins "hallelujah", is kind of a resolution to undo what he has done. When he says "tried so hard to heal the scars..."etc, he is explaining that he tried apologizing to her for what he had done,which was nothing really, but it came out sounding like he had purposefully done everything that happened to her, so she did not forgive him. The stanza beginning with "you say there's no..", explains how harsh she was in rejecting his apology. In the following stanza, beginning with "what did you expect...", he kind of rethinks their friendship and how much it really means to him. He rethinks if it was really worth it to feel so guilty and to try to make it up to her. The stanza "down below.." he comes to terms with the fact that he won't get her back and that the only thing he has left is her "ghost" which is the remenants of his guilt and their past relationship.
I think that he's trying to confess something in this song, like he had something to do with the downfall of "her." He refers to himself as being a "ghost at the scene" which implies that he knew "he" was going to try and bring her down. When he says "I was there at the scene" kinda says that he was there when it happened, and that his hands "smelled like gasoline" implies that he feels like it was his fault, like he figuratively started the fire that led to her downfall. He says that the "headlights murdered my thoughts," suggesting that he saw it happen, but was frozen and couldn't do anything, kind of like a deer in the headlights. The "ghost that remains" is his guilt of feeling that it was his fault. The pre-chorus, I believe, is suggsting that she was innocent and didn't deserve whatever happened to her. In the chorus, he is really just expressing the guilt that is tearing him apart. He wants his "casket closed" so that no one has to look at him, and "your heart beats under the floor" is most likely a reference to Edgar Allan Poes' poem "The Tell-Tale Heart" in which the narrator kills an old man and buries him under the floors of his house. He narrator, in his mind, hears the beating of the old man's heart and it serves as a constant reminder of what he had done, until he confessed to it. When he says "nothing's as it seems" he is recognizing the fact that his guilt is just an imagination. The verse that begins "hallelujah", is kind of a resolution to undo what he has done. When he says "tried so hard to heal the scars..."etc, he is explaining that he tried apologizing to her for what he had done,which was nothing really, but it came out sounding like he had purposefully done everything that happened to her, so she did not forgive him. The stanza beginning with "you say there's no..", explains how harsh she was in rejecting his apology. In the following stanza, beginning with "what did you expect...", he kind of rethinks their friendship and how much it really means to him. He rethinks if it was really worth it to feel so guilty and to try to make it up to her. The stanza "down below.." he comes to terms with the fact that he won't get her back and that the only thing he has left is her "ghost" which is the remenants of his guilt and their past relationship.