World Building Mirror World Pony POV Series · 7:15pm Apr 8th, 2017
The reason Thorax turned evil here is because his prime counterpart was ALREADY GOOD when the connection-mirror was destroyed, he'd simply never had the chance to show his true colors. The same thing happens with 'mirror' Thorax, he was already a monster, he'd just never had the right opportunity to reveal that side of himself.