to finish what he started which we see by the softer moments in this episode - looking at himself wrapping the scarf around mikasa or looking at the dead bodies with guilt. this is quite literally eren pushing his own back into ‘hell’, which is exactly what he says to falco +
the way his memories work actually robs him of this integral part of who he is, and it’s most obvious through the ocean scene. ‘this is all like my father’s memories’ - he is robbed of experiencing the thing that used to hold so much value to him and can’t find any joy in it. +