After spending a week in the Hospital Wing, Alistair was finally allowed by Madam Pomfrey to leave.
"Keep the use of magic to a minimum for the next week, and do not wander around the castle; your body is still recovering," Madam Pomfrey instructed. "Wait here a moment while I have a professor come escort you."
Given that the Basilisk was still slithering around the castle, students were not permitted to walk around alone.
Chapter 138