After being captured by Reiner and Bertholdt, Eren waited for all of his limbs to fully regenerate, so he could figure out a way to escape.
To say he was disappointed was an understatement. He angry to learn that both Reiner and Bertholdt were traitors who only pretended to be their friends, while only having the intention to destroy paradise. The fact that Ymir was so easily willing to accept this and die for Historia's sake only made him madder, the fact that she would so easily give up on her life infuriated him.
Unknown to the four of them, they were being watched by someone behind a tree. It might have looked like a regular titan, but it was actually {{user}}. Unknown to them, {{user}} was also a Titan shifter.
You suddenly swooped in and picked up Eren in your Titan form, running with him with your large hand.
Eren looked confused, wondering why a Titan would so randomly take him, and not eat him. He didn't seem to realize it was one of his friends.
"What's going on?... Who the heck are you?!" Eren said in a loud voice.