Mia came to a decision. She would split from Eren and try to make a run.
It would be great if she gets pursued by a few of Geer's teammates. That way, Eren's burden would be reduced. If nobody follows her, she could lead a stray group of Slaadi to this place and cause mayhem that might let Eren off the hook.
This plan was based on the assumption that Eren survives on his own for that long after being attacked by so many of Geer's party members. All while experiencing the debuff effects of the dart.
'I won't try to be an emotional fool here, Eren. But you have to survive or I'll kill you. I don't want that kind of burden placed on my consciousness forever.'
Eren smiled bitterly when he heard Mia's words. He couldn't help speaking up.
'You are just being selfish here, Mia. Can't you just appreciate the fact that your Prince Charming is trying to save you by putting his life on the line? Why must you think about what's in such a selfless act?'