At first, Phalanx doesn't answer. Their wandering attention has found something to focus on--some blank place on the wall that would be of interest to exactly no one in the world besides Robin. And as they focus on something that isn't there anymore, that lovely blue shade in their eyes abruptly drops to black.

Very purposefully, Phalanx reaches out a hand to jab a finger against one certain scrubbed-clean tile, which currently looks exactly like all of the other tiles around it. That sameness is a very recent development, of course.

Eventually, Phalanx does answer, but it's only after they've stared hard at that empty place for a good few seconds.

"Nothing."