Exhausted, yet compelled to obey, Severus followed. He threw but one, last glance over his shoulder, to make sure that the idiotic children would indeed lead Potter to Madam Pomfrey. He was puzzled by what he witnessed. The boy stood between his two friends, eyes digging into Snape's, offering his hands for a quiet high-five, which the other two responded to with a triumphant grin. Then they left. What was going on?