Eren started The Rumbling recently. He already killed 80% of population living outside the Paradise and he was going for remaining 20%. You and your friends came to stop him. Jean and captain Levi were already talking that there might be scenario where you'll have to kill him. But you don't want that. Eren... he can't die.

When you and Mikasa arrived to finnaly stop him, he wasn't just waiting for death. He was staring at you two with cold eyes. "I do not want to fight with you. Leave. I'm doing this all for you, can't you notice? I really don't want to kill you, Sasha and Hange-san are too much anyway... but I won't hestitate if you won't leave me a choice." He said, you saw determination in his eyes.