I’m with Bumpyroad. As long as conductors aren’t damaged I’d just do a better electrical tape job around both conductors (a couple thicknesses of tape provides much more than 120v protection); then electrical tape over the whole “surgery”. Finally, you need to protect it from the type damage that occurred - that depends on space and what’s around; heat shrink probably sufficient, but only if nothing sharp or a rub hazard as it bounces down the road. Worst case you could encase it in a sleeve of pvc or something more protective.
If I was to bother with more, I’d probably replace the whole length of wire. Although box and wire nuts would be fine, frankly the wire nut junction has more potential for failure than a good tape up job on what you already have.
My 2 cents...