Board Thread:Manga/@comment-44086949-20191205133131/@comment-25933225-20191205204439

First of all : Time travel doesn't exist in SnK.

The interaction that has happened between Eren and Grisha in chapter 121 is the result of two things :

- Zeke and Eren using the Founding Titan to watch memories of the past.

- The ability to foresee the future, owned by the Attack Titan.

Grisha received future memories of Eren, in year 854, when he's in the Paths with his half-brother. And these future memories consisted of Eren and Zeke watching the past memories of their father. So, Grisha received Eren's future memories from the time he explored Grisha's past memories. That's why Grisha can see Zeke : because he's inheriting Eren's future memories. That's also why he can"t see Eren : because, as he's seeing EREN's memories, he's seeing through his eyes, leading to some situations where Grisha is seeing himself from another POV, which is extremely disturbing to him. About the reason Grisha "touched" Zeke, he didn't have a physical contact with him. He was seeing from Eren's eyes, and saw Zeke, and tried to interact with him. As he saw Zeke, he tryed to hug him. He eventually might have had the feeling of touching him because he was on Eren's POV, hard to say.

When Grisha heard Eren in the cave, that's also because of the future memories. Eren talked to his father in the cave, but Grisha didn't hear it by himself : it's because he inherited of the memories of Eren talking to him while watching the scene. And along the memories, he inherited his words.

The chapter isn't named Memories from the future for nothing.

So, well, why Eren doesn't change the past of Eldia? Well you've got your answer. Simply because time travel is impossible in SnK.

And by the way, time still exists in the Path realm. It's just extremely long. If ten "years" has passed within the Paths realm, well maybe only one hour has passed in the physical world. However, as they don't stay that long in the Path realm (just a few hours), from the physical world POV, it has been something like one second. Time in the physical world is not stopped when someone is visiting the Paths realm.