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Credit for Summary: Attack on Titan Wikipedia with additions from me.
Eren finds himself alone with Armin's burnt body and the unconscious Bertholt. His reverie is interrupted by the Cart Titan carrying Zeke, who asserts that Eren was lied to by his father. Zeke departs when Levi arrives, still in pursuit, and promises to return and save Eren.
Elsewhere, Hange interrogates her captive Reiner and sends Mikasa to get the serum from Levi, however the Cart Titan arrives and rescues Reiner.
Meanwhile, Armin has started breathing and Levi prepares to inject him with the Titan serum. Suddenly, Floch Forster, the only surviving recruit from the suicide charge, arrives with the mortally wounded Erwin. Levi hesitates, conflicted over who should receive the life-saving serum. What an agonizing decision Captain Levi must make when he is presented with both Armin and Commander Erwin teetering on the brink of death!
A struggle ensues among the group about who is the most appropriate person to be saved, with Mikasa physically attacking Levi before being restrained by Hange. Levi orders everyone to leave and prepares to inject Erwin, however Erwin withdraws his arm in delirium. Levi recalls his conversation with Erwin, who was prepared to die to help Levi destroy the Beast Titan, and he ultimately chooses to let Erwin rest in peace and give the serum to Armin instead.
Erwin succumbs to his injuries, while Armin has become a mindless Titan that eats Bertholdt. Levi and Hange mourn the deceased Erwin while the rest of the squad share an emotional moment as Armin emerges healed from his Titan form.
NOTE - Injection Conditions: Not only can Titan powers and much-needed information be stolen by using the injection, but it also allows the revival of someone who is critically wounded. The ideal candidate would be someone near death that is already close to an incapacitated enemy with Titan powers.