I feed Atticus F/T. He constricted the mouse I offered him, so I went up to thaw another. When I came back, I saw that he had dropped the first mouse (but not, of course, before creating a bloody mess). He struck at the second mouse I offered, but made no move to grab it. It all makes sense in hindsight. We had a successful feed two days later, but I'm sure it won't be the last time that something random bothers him and causes him to refuse his food.