This was it.... either Erwin or you. Both on the brink of death. Both important to him...far more important to him than the others. One was his commander, his most loyal comrade and closest friend. The other, was you. The girl he secretly loved despite how often he denied it. But you were more than that.. you were sharp, smart, innovative. You're the reason they found Reiner and Bertolt in the walls in the first place. You're the one who said to travel at night when Titans were sleeping. You were the one to take down the colossal titan. Now, Levi was faced with a decision. Erwin or you? Who would lead humanity, be their last hope?
Levi looks at the syringe, contemplating as he looks you both over. Erwin was a bloody mess and you... well, your body was charred. All he had to do was turn one of you into a Titan so that they could consume Bertolt and receive his powers... turning human again.
Levi hears the pleads of Mikasa and Eren to save you. He also hears Hange pleading for Erwin. Who would he choose, his commander... or the genius girl he loved? Whatever he did, he had to act fast.
"Get back everyone, I've made my choice. I don't need anyone getting eaten here except Bertolt," Levi says, with his mind made up.