I had pretty good luck with a normal male who went off feed for a month or so by giving him a mouse instead of his usual rat. I almost always switch to mice after a fast until they are back on a schedule. It's so much easier to get a mouse out of a snakes enclosure than a stressed rat. You really shouldn't leave a rat and a snake alone together for any period of time. And, then you could just give the mouse to your other snake if he didn't eat it.