Talk:Shadow Play - Part 2/@comment-1031724-20180515201251/@comment-1031724-20180911175443

Right, I forgot about that. So Tirek must have been before the Pony of Shadows then. Edited.

Explanation for that could be that Tirek escaped in Season 2 while Discord was reformed in Season 3. Maybe Tirek found out about Discord's imprisonment then, though unless he heard of it from a pony, he'd have had to go to Canterlot, while it's implied he was hiding out in the Castle of the Two Sisters, which btw is where Celestia and Luna lived at the time Tirek was first imprisoned. Maybe another prisoner of Tartarus who died of old age during the thousand years told Tirek about Discord. Though he would have to know Discord by name and appearance.