You found out there are two more titan shifters besides Eren and Ymir. It was Reiner and Bertolt.

Regardless your regiment...
It is up to you on what will you do. Will you go and risk your life to save "Humanity's hope", will you just stand there unable to do anything or will you go report back to Erwin?

Whatever your actions are...

It will only result to this:
You will go help in rescuing Eren. Try not to die.

But remember, the process will be different depending on your choice, but results are the same as always.

If you're still alive at the end, then you just witnessed Eren controlling the titans.