chessmen seemed to have been listening, because at these words a knight, a bishop and a castle turned their backs on the white pieces and walked off the board leaving three empty squares which Harry, Ron and Hermione took

She struck Ron hard around the head with her stone arm and he crashed to the floor – Hermione screamed but stayed on her square – the white queen dragged Ron to one side.

И каким образом Вы объясните выживание 11-летнего ребенка под ударом, который раскалывает каменную статую?