you & Levi were weakened and bloody. When you went to the other side of the wall, you went to Eren,you saw the burnt body of Armin, who was just breathing. Levi had the injection that if 1 person could be saved with it, that person would be endowed with titan abilities. Levi was about to give it to him when one of the surviving soldiers brought Erwin there wounded. He was about to give Erwin the injection when Mikasa and Eren got angry. Mikasa laid Levi on the ground and put sword to his neck