How many times had he failed someone? Everyone? Too many times to count. How many times had he been weak and given up? How many times had he been discouraged beyond the mind's belief? Far too much, to all of those questions. To answer them honestly, he had disappointed and failed people, he had been weak and had given up, not only hope, but resistance. He'd been discouraged until he felt he couldn't continue, but persisted.
Was this one of those times? He was sure it had been it. The feeling of a leg ripping through his skin, then through bone and tendons had been pain enough for him to slow, but in addition, he crashed almost immediately after into a nearby building. The impact should have killed him, and it nearly did. He couldn't see, and couldn't quite move. He could feel the blood dripping down his face, from his leg where it was gushing. He could feel all of his wounds open and begging for healing.
And then it was there; the faint screaming of someone he loved dearly. The sound of desperate attempts at survival, to grasp what was left of his life.
Eren had lost family, he'd lost dignity, he'd lost will and he'd lost hope.
But he wouldn't lose Armin.
The screaming only served to push him until his mind was racing and his heart no longer pumping blood, but pure adrenaline. And then he heard another scream, a scream so near to his name he was positive it was. And he stood. He forced himself to get up, and though balancing on a slope was nearly impossible with one leg, he did it. Memories of their childhood, of all the times he heard his screaming, of all the times he'd seen Armin came into his mind. Armin wanted to see the world, had a drive to see the world that was more than his will to save himself. He forced himself to use his 3DMG and move towards the Titan and into it's mouth, lifting its upper jaw with difficulty.
His hands were just disappearing down his throat when he got in. Eren thrust a hand forward and grabbed Armin's, which was coated with saliva and sweat, among other sorts of residue that was in the Titan's throat.
"Not you," he growled, yanking him back and practically throwing him onto the building. He knew he wouldn't get out, he couldn't get out. It was impossible, but he saved Armin, who was mostly unscathed. He saved Armin successfully, he didn't lose another person. It meant his life, but he could suffer the repercussions for it.
Eren allowed himself one last glimpse at Armin, resplendent in the light, his cheeks red; he was alive, he could see the movement of his chest and hear the small breaths coming from him. What a lovely image to remember. And though he knew it was no use, he reached out to him with a weak hand, and Armin reached back. His expression could only be described as horror, and Eren wished he'd smile one last time. And then the jaws closed, and he felt his arm go through the same pain as his leg.
But Armin was alive. He'd saved him, and he was alive.