I'd rather have a gun, but it's pretty hard to pack much of a gun when running due to the weight of the gun and the jarring of your feet hitting the ground. For that reason the knife idea has some merit. I've got one of these that would work pretty well for the purpose-

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Lightweight and inexpensive and stays put pretty well. Adding a lanyard to the skeleton handle would probably be a good idea to help keep from losing it in a scrap.

Still rather have the gun, though.

4 out of 5 Great Lakes prefer Michigan. smile