the first doctor, sitting on the edge of consciousness, talking to the thirteenth doctor in the power of the doctor, saying, "well, you're obviously one of the more determined of us."
thirteen says, "i'm sorry?", she's clearly confused.
wide shot of the two of them, one says, "you refuse to pass through."
he goes on saying, "quite the strength of character,"
he finishes, "this incarnation, hm?"
thirteen looks at him in bewilderment.