What McCoy did was reckless, but also born of desperation. I find it less excusable what was done at the end of the season in “Operation—Annihilate” when they tested the bright light against the creature without Spock having some sort of eye protection and not first running an analysis to determine if they really needed that bright light or just a spectrum of it, which turned out to be the case.Wait, what plot difference did getting the communicators back make? McCoy tested the antidote successfully without them.
Once the landing party's inoculated, they're under no time pressure.
I haven't watched these shows in decades, so...
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