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Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] If Molly Weasley had died in her duel with Bellatrix, would Ginny be protected from her with the same ancient magic that protected Harry from Voldemort?

Title pretty much sums it up. In the movies, Bellatrix attacks Ginny which causes Molly to step in and protect her. Molly ended up winning that duel but if she hadn’t, would that have activated the same magic that protects Harry from Voldemort while at the Dursley’s?
gpt
I believe the suggestion is no. For the same reason that James’ death didn’t protect Lily. It’s not enough to die in the defense of someone else, you have to fully sacrifice yourself for it. Lily’s sacrifice worked because she didn’t fight back, had the opportunity to be spared, and chose neither of those options. 

Molly was fighting. That removes the possibility for giving her protection. She also, once she and Bellatrix were engaged would not have been given quarter and would therefore not have the option of being spared.  Would she die so Ginny would live, almost certainly, but if that’s all it took there would be a lot more people under that spell’s protection.