Mind anybody explaining the timeline where Eren was waking up Mikasa? Im confused.

Might be a vision if Eren and Mikasa escaped together in chap 123? Not sure if that's the chap but it's when Ereh asked what he is to Mikasa

im pretty sure its just like a little vision eren was putting into mikasa's head. like a little 'what if' memory or a a perfect ending scenario for them to enjoy caz eren knows hes going to die