When Clara is faced with the loss of Danny she gives up. She doesnt activate his emotional inhibitor to allow him to answer the Doctors questions but because she wants him to destroy her. She wants to end her own emotions. Its brave of Steven Moffat to honor the depths to which an overwhelming grief may bring us. The sight of Dannys face encased within cyberman armor is chilling. The horror of a deceased loved one returning in a form that remains out of reach is well played. The Doctors emotional reaction to his inability to find Gallifrey is startling. We are used to his determined insistence on preserving his poker face yet he cannot maintain the façade in the light of the Masters betrayal. He lashes out in fury, violently attacking the TARDIS and collapsing with heartbreaking cries of anguish.