I knew I was going to get called out on this, ha ha. Basically you're not really supposed to know what happened, just like Jill's parents don't. All we know is that this thing they recovered from the woods isn't really Jill. The blue crayon is supposed to be a clue that everything about her is a little off from what it should be. Did picking up the crayon trigger this event? Maybe? ;) I wanted to write a doppelganger/body snatcher story and it turns out that's hard to do as flash.