I love your fire, but we wouldn't want you to get burnt.
Clearly, the lesson hasn't been learnt.
The sheet of paper had been crumbled and tossed into her locker, its wrinkled state showcasing his anger towards her defiance while also emphasizing the impending doom. Normally she would have been scared by the subtle threat, but Cassidy now knew the pattern of his game.
A note from him, while sardonic, would usually be planted to weaken her mentally. Unfortunately for them, Cassidy refused to fall into turmoil due to a simple threat.
The fire incident was her weakest yet strongest point during the kidnapping. While the predicament cost her mental, physical and emotional scars, it also strengthened her resolve. She presumed that the worst was over and there wasn't much to fear, and that was enough for Cassidy to continue facing her kidnapper.