I’m Clara Oswald. I’m the Impossible Girl. I was born to save the Doctor.
So this happened right after Clara told him she’d met River Song. Do we really think he was this upset about seeing his own grave?
So, there’s been a reference to each Doctor’s era in chronological order since The Rings of Akhaten. If this holds true, there should be a mention of Six’s in Nightmare in Silver, and Seven’s in the finale…
“You are enormous parts of my life.”

