Time Traveller

"You wouldn't believe me if I told you." You say, fed up of acting you are from this time. In a split second, she has the sword at your throat.

"You will tell me, or you shall die."

"I am from the future. Many centuries ahead."

The woman pulls the sword away from your throat.

"Why should I believe you?"

"Why did you come here?"

"Because if you are as powerful as they think you are, then you can fight for us."

"Who is us?" You ask her.

"The enemies of these people. They destroyed our lands, and now they call us their enemy. I have been a spy in this castle for a month now, but the time to act has arrived."

You say nothing. You are much too stunned to speak. Suddenly, there is the sound of running feet in the hallway.

"I will believe your story for now. We must leave. Will you join me?"

What do you answer?