Atop the wall of the Red Keep, Tyrion watches wildfire destroy both fleets. He thinks the destruction is as much Stannis's fault as his.
Seeing the men coming ashore, he gives the order for another sortie before they can properly regroup. He also orders the catapults turned thirty degrees, but Joffrey whines that he was to command the catapults.
Tyrion relents if only to keep Joffrey occupied and away from the fighting.
Word comes that the enemy force is ramming the King's Gate, so Tyrion heads for the gate and commands the commander to form the ranks. Ser Clegane refuses to go back out with the fire and abandons his post.
Tyrion takes the command himself. The soldiers are reluctant at first, but Tyrion realizes that if he—the "halfman"—goes out, then the others must follow or else be shamed.
Tyrion unsheathes his axe and charges through the gate.