Hey!
Today after seeing the clips of people getting into paladin class hall using heroic leap, i realized that i could use the Day of the Dead costumes to mimic heroic leap and get inside.
After messing around and using a glider to get past the stairs roughly 100 times i decided to try a lag macro to get past the guards, which throw you out. And it happened to work.
What i did to manage this was glide all the way down the stairs in the beginning, hit the lag macro before guards spawn, close WoW in task manager, log back in and run as far as i could before the guards spawned. I got into the end of the room (with the altar etc.) and there are no guards there.
I am sorry if my instruction on how to recreate this is a bit messy, but i decided it is worth sharing, so others could try this out.