Quote Originally Posted by DarthEnderX View Post
Hmm, I guess I just came to that conclusion on my own and between seasons forgot that the humans didn't actually figure that out.

I mean, Annie had that metal ring she used to cut herself and transform, and Ymir used that knife. And I might chalk that up to "Well, they just have to bleed to transform, like when Eren bites himself" but then there was that time Eren transformed when he picked up that spoon.
Not sure, but weren't there just as many transformations without the use of a metal object?
Or does Eren have a teeth out of iron.