I'm not a snake, but I'll take blunt trauma to the head over freezing anyday. May not sound classy but I bet it was quick.
Unsupervised feeding that results in any injuries really agitates me. When I explain to non-snake owners that if the snake doesn't eat the rat then the rat will eat the snake they just look at me confused. They just picture BPs as unstoppable killing machines and can't fathom BP's needing to be protected against rats.
I will be saving these pictures and will be showing them as examples to any 1st time snake owners buying one of my BPs.