Waait a second, are you serious? Never heard of this before. How would you thaw and heat up a half-rat?
Edit: Good that he ate it no problem. For future reference though, bring your food scale to the rodent store. The reptile store guys all know me as the only guy who brings a scale to weigh out every feeder that I buy, but I dont really care if Im being annoying. I'd rather get appropriately sized meals for my snakes.