Good luck i hope all goes well. Good its rehydrated just make sure you keep him that way. Give him a good secure hiding place good temps and good humidity. Try puting him in a box with the rat dead of course and close it up preferably a dark closed box like one of those opaque rubermaid crates close it up and check up on him after a while. It might and might not eat but that always works for me. My bp is about a year since i got him maybe he is about a year and 1/2. I have been feeding him small rats and everything goes good. I have had a rescued Bp die on me and its very sad. I wish better luck to you.