Being a time traveller is all about staying in the background and fixing things where they go wrong, when they never should have gone wrong in the first place. Like the shadow that leads lost adventurers to their prize, that random guy who says just the right thing to the hero, or the merchant who sells you exactly what you need?
The Doctor does his fair share of those.
Sometimes however, you have to be a bit more direct. As in fixing temporal anomalies- events in time that should never have happened -direct.
This is that story . Well, sort of.