My son found a garter snake out in the yard that had gotten caught in a tiny hole over the wheel of our lawn mower. Basically half the diameter of his body. He took the wheel off and used butter to help him scale by scale through the hole. He is swollen and battered from the hole. We cannot take him to a vet. He can still move his tail and his body above and below the bruising. Should we let him rest in a tub in our house for a week or so? Or would he be better off released into the woods? Any advice would be much appreciated.