From Dark Water:
It seems to me the same kind of "paradox loop" exists in TOTD when Clara implores the Time Lords to fix the Doctor's death. The Doctor not dying on Trenzalore means there's no grave on Trenzalore, which means NOTD never happens, which means the GI and Echo Clara never go back into the Doctor's timestream, which means The Snowmen never happens, which means The Doctor never tracks down the Impossible Girl, which means their whole relationship never happens, which means she's not there on Trenzalore to ask the Time Lords to change those events. Paradox loop. The timeline disintegrates.
Has this paradox ever been addressed? Was it some kind of Time Lord magic that Gallifrey could do for the Doctor but the Doctor couldn't do for Danny?
CLARA: And fix it. Change it. Change what happened. Save him. Bring him back.
(She holds up another key and we all remember what happened in Father's Day.)
DOCTOR: No.
(She throws the key away.)
CLARA: Five left. Every time you say no to me, I will throw another key down there. Do we understand each other?
DOCTOR: Well, I understand you. Let's not get carried away.
CLARA: Time can be rewritten.
DOCTOR: With precision. With great care. And not today. But you know that of course, otherwise you wouldn't be threatening me.
CLARA: Did you just say no?
DOCTOR: If I change the events that brought you here, you will never come here and ask me to change those events. Paradox loop. The timeline disintegrates.
It seems to me the same kind of "paradox loop" exists in TOTD when Clara implores the Time Lords to fix the Doctor's death. The Doctor not dying on Trenzalore means there's no grave on Trenzalore, which means NOTD never happens, which means the GI and Echo Clara never go back into the Doctor's timestream, which means The Snowmen never happens, which means The Doctor never tracks down the Impossible Girl, which means their whole relationship never happens, which means she's not there on Trenzalore to ask the Time Lords to change those events. Paradox loop. The timeline disintegrates.
Has this paradox ever been addressed? Was it some kind of Time Lord magic that Gallifrey could do for the Doctor but the Doctor couldn't do for Danny?