Huh. Did he draw the attention of this other girl? She tells Kasumi that she shouldn't be going to Tartarus alone. Kasumi then points out that Makoto is going with her. "I didn't want her going alone, and the Shadows won't attack me either." Which he worries makes him suspicious, but he doubted the girl would let him go if she was aware that he was a civilian. Or at the very least couldn't summon a Persona.