Time Traveller

"Healers over here please!" You hear someone shout. There is a group of healers over in one corner of the courtyard, so you go over to them.

"Is everyone ready for this?" One of them asks. You don't know about that, but you are ready to escape. Suddenly, there is a shout from the walls.

"There they are!"

You climb the walls to look, and sure enough, right across the hills, you can see a massive army. You can't fight this battle!

What should you do?