Jack can only look on in horror as their attacks suddenly start working. There is a wordless yell of anguish when she falls, and he stares at his own hand. He wouldn't have cast if he had known it would work.

I couldn't save her. Again. What did she know that we didn't?

Jack sinks to his knees, and his sword falls to the crystal surface with a ringing sound.

Kalki, Garland, the names start to mingle with countless others in Jack's mind, some human, some not, all those who have fallen at his and the Doctor's hands, to prevent them from destroying the world. "Why do you always make us kill you?"