Apparently, Twilight's leading theory is this whole situation was caused because of a 'Spell' Twilight had cast on her own food, when they were cooking their burritos. Something about a one in billion timing sparked by another one in billion match of energy, like that "run into a wall enough times and your atoms might perfectly align and you'll slip right through" type shit. Barnon would spare his brain the strain of thinking about it any longer.