[He's surprised at the lack of reaction; can't imagine that Eren would be so calm. Unless he's already aware, somehow? Reiner might not have thought him capable of that kind of restraint back when they were just kids, but...]

We can manipulate the world around us, right? Saying it like that makes it sound easy, but it takes practice. That's what I figure, anyway. Maybe you and Eren are just naturals.

You must have met here, I guess?