I believe the thesis in this is actually the first sentence considering the rest of the story talks about that first sentence.
It helps you imagen the scene better and to understand the setting. Hope this Helps
It may be a Hyperbole or Satire. Since sawing someone's leg off is likely to be exaggerated, it may be a Hyperbole.
At the same time, depending on the context of this sentence, it may be said for the purpose of humour, so Satire.
Hyperbole seems more probable in my view. :)
It is a metaphor for Lily's situation because her situation at the pink house will not “stick” much longer.
If it does not contain Carbon.
