If you're a scout:
You headed out for the expedition yet, you had a bad feeling, that what happened 5 years ago, will happen again. But you have to focus on the mission at hand

If you're at Garrison:
You had to help the newly trained cadets in defending the city. Don't chicken out!

If you're an MP:
You happen to stroll at Trost. Walking around, having fun. Not until the Colossus Titan appeared, destroying the wall. What will you do? Help in defending or will you run away from the battle?