Aww your snakes are very cute! Kisara's big pupils are indeed adorable haha, my BP's eyes get big like that as well when he gets fed.
For Ralph I agree with Bogertophis that it's likely that the rat was not warm enough. My BP is also like that sometimes - he'll be very eager to eat, but if I don't warm up the rat enough he doesn't recognize it as food when I offer it to him. However, he will always take the rat if I remove it, heat it up adequately, and try feeding him again.
A larger rat like the one in your photo is also harder to heat up all the way, especially with a hair dryer. I'd recommend thawing it for 3-4 hrs outside of the fridge, then heating it in a container of warm water (the hottest water that will come out of the tap) for 10 mins, changing the water, waiting another 10 mins, and then offer it. That way the internal temperature of the rat will be warm as well as the external temperature.
If your BP hasn't eaten for a while, maybe try a smaller rat next time since that will be easier to thoroughly heat up and may be easier for him to eat.
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