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Okay, I'm lost. Tegan says she's leaving because she's stick of all the death, which is "not a solid reason" and "she's seen so damn little of it compared to the Doctor and Turlough." And then the recap goes on to give this episode's body count as higher than any other serial so far. So what, exactly, is the problem here? It seems pretty clear to me. After all, the Doctor's used to it and Turlough has had no trouble being hired as an assassin.
I agree with you that Tegan's reason makes sense. Everyone's tolerance for death is different. so it could be that hers is much lower than the Doctor or Turlough and that this episode (with such a high death count) put it over the edge.
I think the recap needs to be edited to remove "not a solid reason" and "she's seen so damn little of it compared to the Doctor and Turlough" parts because they seem to be the personal and subjective interpretation of whoever wrote the recap.
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How well does it match the trope?