You know... I thought it was established that the calamity was like a force of nature. So it would make absolutely no sense for it to "magically cause a fire just because kids were listening to some tape".
If you ask me, the whole thing works more like a script. That's like kind of this:
if (conditions unknown)
{
var victim = selectVictim(parameters unknown);
victim.changeOdds(parameters unknown, but it presumably changes the odds of bad stuff happening to this person);
}
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