Prayer.
Unless you are very strong, very quick and very lucky, you very likely die in that extreme scenario. It is not possible to prep for everything.
The best you can do in some conditions is to respond appropriately to the immediate circumstances that you are facing. Are you a fighter? Then fight. Are you a runner? Then run. Are you a talker? Then talk. Anything that you do might help. You won't know until afterwards.
If you have an intact supply cache nearby, of course you can open it up and use what is in it. Better have enough for several people to use. Better have some reliable family members or reliable friends to share it with. That is the master preparation right there.
Selco and Fernandez pointed this out very clearly in their writings. They both survived extreme breakdowns in their social order, which lasted for years. Keeping a very low profile and teaming up with a small group of close relatives, or a few friends was their key to survival under worst-case conditions.
“It is not possible to prep for everything.”
That was my point. Some people just can’t admit that and come up with some really ridiculous and unrealistic ideas.