My daughters king snake got out in the house, we found him in the basement attached to duct tape, my father and brother peeled it off him real carefully, luckily he did not lose any skin or scales. We got lucky. But I believe that had he not gotten stuck on the tape, we would have never found him again, my daughters room is on the 2nd floor of the house, nearest I can figure, he went through all the crawl spaces and ended up down there. He is still alive and OK.

It may be your corn is just stressed or just plain wore out from struggling with the tape, I would take him to the vet cause it does sound like he may have had a worse time or been attached to the duct tape longer than ours had.

And- as far as your son, I too have kids so I know where you are coming from. When you have to explain to him what happened, just be honest and tell him that you will understand if he is mad at you, but you did not mean for this to happen. Kids are more forgiving than we give them credit for. They too realize accidents happen to.