Because if he stops, even if only for a second, he will be overwhelmed by his 900 years of life and all the pain and guilt he has experienced. That's why he shuttles across the screen with a desperate madness. He is the kind of person who uses humor to cover up his feelings; he speaks so fast because he doesn't want to leave a pause or listen to what others say.
In fact, this is a very cold feeling. From the surface, we can find that DT’s Doctor has boundless abilities, and he chose to travel to prevent himself from destroying the universe because of all the injustices.
He can be very kind, and he can be very kind, but don't think that he is a perfect and good person just because he is kind and kind.
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