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Physics

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    $\begingroup$ If you both are at rest w.r.t. each other, you will not see each other moving, so you won’t miss if you shoot it straight at them. Third/fourth/fifth/etc observers are irrelevant. $\endgroup$ Commented Jun 4 at 22:41
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    $\begingroup$ This question doesn't seem related to the equivalence principle. Perhaps you meant the relativity principle... $\endgroup$ Commented Jun 4 at 23:17