Talk:My Little Pony: Friendship is Magic (comics)/@comment-11677914-20140614174542/@comment-5837525-20140614181157

On page 9, Celestia says whenever Star Swirl went back to the other Equestria, Celestia insisted on accompanying him, and after Luna was gone, she started going through the mirror alone. So at the time of their first visit to Sombra's Equestria, the Luna of Celestia's Equestria hadn't yet become Nightmare Moon and the evil King Sombra hadn't yet risen to power.