If you're a scout:
The scouts will return to the wall because of the news they heard about Titans breaching Trost District.

You came back, finding a cadet named Eren, coming out of a Titan, but, the wall had been sealed. It is up to you if you will see Eren as an ally or foe.

If you're at Garrison:
You heard of a cadet namely Eren, had came out of a titan. Well, you actually witnessed it, and saw him fighting titans. But others want to kill him. To whom will you side? The soldiers or Eren & his two best friends?

You had heard of the plan of regaining Trost with Eren's help. Will you support it?

If you're an MP:
Since you happen to know what happened at Trost district, the scene is just the same as the Garrison. But, will you protect Eren and his friends from the soldiers?

You had heard of the plan of regaining Trost by using Eren. Will you support it?