It's not only BPs anyway- I have a corn snake that is a very enthusiastic eater, but if she sees ANY motion outside her tank after she has grabbed her mouse, she drops & ignores it to come after me, or rather my "motion"- that apparently in her snakey-mind might just be a bigger, juicier mouse? But at least once I make my "get-away" she'll go find & eat the mouse she dropped.
I know it's because she doesn't have my scent thru the glass- to most snakes, visual recognition doesn't happen- it's all about motion, which is either predator or prey. Corn snakes don't have heat-sensing pits, so at least that makes them much easier to feed. BPs rely on heat more than scent, so they look pretty goofy when their prey cools off & they can't seem to find it.
Every now & then, I've had a snake grab their prey tail-first, & they hate to let go, much like your BP. But I suppose it's a bit like people that refuse to stop & get directions when they're lost, & just keep going the wrong way.

(I wonder what snakes would say about us?)