If its as simple as you not giving him a fully thawed mouse and he rejected it, your BP should be fine. You seem to know what you did wrong and will hopefully not repeat it. I suggest giving him a day or two to forget about it and try feeding him again. Of course, keep an eye on your buddy to see if he starts to act differently. You mentioned that he couldn't get it down meaning it was in his mouth. The only concern I would have is he may have lost a tooth while trying to spit it out. Not a huge deal at all but if he starts to act differently like constantly opening and closing his mouth or refuses to eat, you may want to investigate that.. Good luck..