It's been quite a while since I've dealt with any mites, but I don't recall any of them moving that fast.There's many kinds of mites though, not only snake mites. And the speed of this "thing" reminds me more of a tiny spider. It's a bit of a track star.
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Also, when you squish a snake mite, you should see a tiny bit of red (blood). Did you do that when you removed the mite?