The Doctor turned back to the Master. "Look, just because I took away your reindeer toys doesn't mean you have to bring it up. We've got something a bit more serious to deal with than---"

Beep.

The screen on the device flickered, and then went out. The Doctor gave it a slight smack, but it remained dead.

"That's not good. Something's psychically blocked the connection, keeping the device from finding its center."