What’s the primary lesson we should all take away from this week’s episode, kiddies? It’s the lesson that Tabitha obviously did not bother to learn (which does make one wonder what they’re teaching FBI agents at the Academy these days), the number one rule of Zombieland, a movie she must never have bothered to watch, or else she wasn’t paying attention, or else she forgot. What’s the number one rule of Zombieland? Say it with me, now: Double-tap! She neglected to do the double-tap. Granted even if she had shot Charley a second time it probably wouldn’t have killed him—the guy did survive being autopsied, after all—but she could have definitively removed Bing from the playing board. Had she done so, Charley would have had to find himself another Renfield, and this would have taken time. It would have bought time for Vic and her crew. Because Tabitha neglected to make that second shot, well, we all saw in the previews for next week’s episode all the bad stuff that’s going to happen.
It’s necessary for the story, then, that Tabitha was neglectful. One could argue that she was wounded herself and not thinking clearly, or that her FBI training forbade her shooting a suspect once he was (to judge by appearances) restrained. So we can be generous and not say that her negligence was a contrivance for the writers. But it was still a bonehead move on her part.