["...this place's fate isn't set in stone," Maruki says; Eren's heard it before. He doesn't quite know what Maruki's talking about, at this current moment, too entrenched in the dream; the words still make him prickle.]

Nothing will change if we don't fight. [There's a terrible sound - a rumbling. All around them, the massive stone walls begin to shake and fracture, large fissures crackling through the stone.]

I will fight. [That brief flash again - a tall body in dark clothes, hair tied up. It doesn't last.] If no one else will, then that's what I have to do! I can't just let her die!

[He hasn't answered the question - or, at least, not with words. The walls continue to quake.]