Marco nods silently to confirm Galliard's words, but his gaze never leaves Reiner. He watches the older teen closely, as he begins his explanation. As it goes on, his shoulders slump a little, his hands unclenching from fists and pressing against his legs.

"You told me it was a joke, what you two were talking about... I didn't believe you, but I tried to get away by pretending to."

His tone is hurt and regretful, because even if he'd figured it out after talking to Armin he understood why: he'd simply been foolish enough to overhear and then announce himself in disbelief. He drops his head, burying his face in his knees.