My itchy editing fingers what to change to: "Fire is known for it's transformative properties. Though primarily destructive, it burns away the impurities. The finest steel is forged in the hottest flames. So when Tom torched my car, he was turning me into a better weapon."
But I know you are looking for an interesting voice here--so ignore my twitchy, itchy fingers! I'm in editing mode on the YA---AGAIN. arghhh.
Your edits make it punchier, sure. The question is whether punchier is what the voice wants.
As opening lines go, compare:
1) "OK, he's dead. You can go ahead and talk to him."
2) "You are reading this book for the wrong reasons."
3) "It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair, we had everything before us, we had nothing before us, we were all going direct to Heaven, we were all going direct the other way— in short, the period was so far like the present period, that some of its noisiest authorities insisted on its being received, for good or for evil, in the superlative degree of comparison only."
Each of them serves to set up a very defined voice, in distinctly different ways, no ?