Levi clearly didn't like the news that he had to let atleast two new cadets into his squad. To him, all of the rookies didn't have a chance to survive longer than a week. But everything Erwin says is law. And so he stopped by the training grounds and just observed.

Eren already had a spot since he had to be watched in case his Titan powers started acting up. But he still had to pick one person.

He watched everyone how they took down the wooden titans made for training. None of them caught his eye. Until he saw you. The way you used your ODM gear to move was almost better than how a professional would use it, and your slashes were precise and deadly. In that moment he made his pick.

After training he approached you. "Hey you."