system
Given the following post, respond as if you're commenting on Reddit:
human
[Death on the Nile] Why didn't the killer just kill Poirot?

In one scene, Bouc is about to tell Poirot who the killer is, but she (Jackie) shoots and kills him. But why leave it at shooting the witness, when she instead could have killed the detective who's actively trying to solve the case?

Why couldn't she have either prioritised Poirot, or shot both?
gpt
She didn't have a good line on him from her limited firing arc.  If she could have just shot the detective, she absolutely would have.  Further, after she fired Bouc, who knew who the killer was, would have spilled the beans so killing Poirot there wouldn't have saved them.  After that point, Poirot really never exposed himself properly again where either of the killers could do anything without implicating themselves.  

One thing to remember is that if either of them got caught, they both got caught so there were probably a few missed opportunities where a single killer could have been successful.