The fake tag rule is a safety rule to prevent fielders from inducing a slide when it's clearly not necessary. Completing a tag on a runner who's on base, whether in a perfunctory or actual sense, isn't that. Sometimes it's just following thru on the natural motion and no one thinks it's a real tag. Or it could be a real attempt to make sure the runner didn't pop off the base or something. Either way, that's not what this rule is talking about.
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