Itachi stared after Tomas, too startled to immediately take chase. His face also went pink.
Well, it's true. He had to admit that. He didn't want anything from Tomas, not really. He wanted the boy to be safe and happy. That was all, and what did Itachi get from that?
He got something. He knew that. He was using Tomas to fufil some need he had, but he couldn't (or didn't want to) put his finger on it and truly examine it. Instead, Itachi shook off his paralysis and started after Tomas, though he'd already lost the boy in the crowd.