I will just copy what I have just posted in another thread about this topic. The reasoning behind there being a greater chance of being bitten is simply because before moving your snake to a separate enclosure for feeding, you probably were handling the food in order to prepare it for feeding. You now not only have the scent of food in the air around your snake but also on your hands. Your hand is naturally a warm signature to a snake because of your body temperature and a warm heat signature + rodent scent = bite waiting to happen.