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He needed to be able to save the boy. Why did someone so young need to die for the betterment of the world? The Doctor was unable to shake all that he was feeling.
While he told Tegan and Nyssa that there was nothing that could be done, it was untrue; he just didn't want their harm.
Long after the two of them are asleep in their room, locked in without a way to leave until he is back, the Doctor enters the control room.
It only took seconds to throw Adric inside and take his place in the freighter.