If it is cut more or if it is pancaked, it is time to cut the bad section out and bypass it. Hopefully, there is enough slack to pull this fix off. If not, hopefully you’ve got wire to splice in. Anyway, I trim 1⁄2- to 3⁄4-inch of insulation from each side and twist them together side-by-side. Then fold the wire back on itself, as shown here. Tape it up tight and it should hold together till you get home. This is different than how I solder, because without solder the wires pull apart—unless you do this. Fix it when you get home.