For a moment, Eponine just stares. She looks the young boy over, takes in everything from his appearance to his clothes, and this lasts for quite awhile before her voice returns to her.

"Gavroche."

In a similar vein, there is no emotion in Eponine's voice. She had not expected to see him, but there he was, and how strange it was to see him. And he had mentioned the barricades. Had he died upon them too? That was just one of the many questions bubbling up in Eponine's mind, but all she could do was look at him silently.