Burning alive

[Lizzie]

My heart pounds and I struggle to breathe, but each second seems like an hour as I stand there helpless and ashamed. 
Still I watch your burning silhouette through the shear blinds that shake as you writhe and scream. -- sheer
There's nothing I can do. 
No one to call. 
The fire has consumed you now and all I can do is watch in horror until you convulse and collapse in a lifeless heap. 
It is silent now, except for the pounding in my chest that beats in slow motion. 
The patio light shines on me like a spotlight on a circus clown. -- good line, nice imagery
I creep quietly away, cold and alone, because your fire no longer burns for me. -- cold and alone is a bit of a cliche

What's throwing me off is the last line that seems to imply that the speaker wants the person to be burning again. Maybe that's intentional, that for the speaker there was or would be a different kind of burning, but the scene we have before us is one of horror, and I don't understand why the loss of that fire would be lamented.