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Is the cavalry an inversion of Red Shirts?
It's more akin to Big Damn Heroes. Yes, it does subvert (sometimes double subvert) Red Shirt by default, but it involves rescuing the heroes.
Does it count as the Cavalry if its just one person? I'm thinking of those apparently hopeless situations that get turned around by the timely arrival of someone with the perfect skill set.
What would it be called if the Cavelry swoops in, allied with the bad guys? Not a Cavalry betrayal as the cavalry is clearly on the side of the bad guys from the start. Or is that just an inversion of this base trope?
An evil cavalry aiding the bad guys? I think it's simply the same trope, just from the other side's perspective
How does this trope differ from Big Damn Heroes?
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How well does it match the trope?