"Yes, he is. While Sans-Serif is preoccupied with his temporal interference training, we're supposed to handle S-4's behavior modifications. He's not going back to his pod. All he'll do is whine about his fellow experiment's absence."

That seems to grab S-4's attention.

"Where is my brother? What's he doing? Can't I go see him? I-I'll be good this time, I promise..."