*** Within the world of ''Series/DoctorWho'', going back on one's own timeline is a ''strict no-no'' — in fact, there's something about it called the Blinovitch Limitation Effect. The Doctor's code is less "honour before reason" and more "try to do as little damage to the timeline as you can." After all stories where history is changed usually cause disastrous consequences (see "The Waters of Mars"). As for not saving Adric, well... [[TheScrappy This is Adric we're talking about]].
** Also Lancelot. Much to Guinevere's exasperation, it's almost as if he and Arthur are in some kind of competition as to who can be the most stoically self-sacrificing. (Lancelot's winning).
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