I haven't had the luxury of seeing a mouse or rat get mauled
But im sure sometime in the future I will.
My bp isn't a picky feeder at all. Has his food down in 5 mins.
Yesterday he even took a f/t mouse. but that took 30 mins of dancing and reheating it lol.

I think It just depends on the individual snake. Some are picky, others arent. :]