It's not hard to notice the sadness in his tone when he says that, but Terezi doesn't really know how to draw him out of it. She's only just met him.

"I don't know. Meenah probably would. She seemed feisty to me." Terezi grins and shrugs at that, enjoying her little namedrop--one of the few she actually knows. "I bet she could impale someone from several yards away."