 Ser Gregor Clegane oversees order here, and arbitrarily has many of the prisoners tortured and killed.Gendry is nearly tortured and killed but is saved by the arrival of Lord Tywin Lannister, who chides Clegane's men for their reckless treatment of the prisoners.Due to Jaqen H'ghar's help, Arya, Gendry and Hot Pie are able to escape Harrenhal.