Phalanx's lightless eyes shift over to the hand caught in Robin's grip a second too late, as if there is a delay in noticing (or caring about) the discomfort. They've at least probably received the threat hidden in there, though it's hard to tell for sure. Their growing expression is more one of confusion and concentration as they grapple with the question.

"What I am. Mm..." Fingers twitch in Robin's hand, and Phalanx looks to the side, where the nearest sounds of people are coming from. "I'm... tall. And twenty. And twins."