I have had the same thing happen when pulling the Mule out of a canyon with a couple of bull Elk in the bed and I snagged a tree stump with the rear hitch. It is a pain, but remove the winch and then use heavy leather gloves and a big pair of pliers, a hammer, and a chisel to knock the wound in end out of the loop. Then just pull and unwind the cable, and watch your eyes - they like to fling loose at the most inopportune times. A little oil always helps the cable slip out of the locks it will have achieved when it snapped back in.
If you are handy with a thimble, you can untwist the unbroken end of the cable and make a new loop to connect to your hook, and you will be in business in short order.
If you are handy with a thimble, you can untwist the unbroken end of the cable and make a new loop to connect to your hook, and you will be in business in short order.