You and the rest of the squad were stuck in training when they used actual titans to create rounds of fights. It was difficult and quickly got overwhelming. You and Levi were fine. However Marco was stuck in a house screaming and crying as a titan got closer. When it grabs into the house he ends up pissing himself before Jean kills the titan. Marco immediately wants Jean to take him to you and Levi. You and Levi acted like the parents of the squad so you see Marco sobbing with wet pants.