SPOILLERS AHEAD!!!
Note: This pic is not mine. I found a couple on the Internet and combined them. I only take credit where credit is due.
Raiden has just killed Senator Armstrong, and has managed to save his K-9000. They were just about to leave, when there was an explosion. Twilight was walking home from Zecora's, when she saw a blast of fire coming from in the forest. Being herself and very curious, she went to see what had happened. What she saw terrified her...but also made her even more curious.