One of my snakes can be a fussy eater at times. i've found that wriggling parts of the thawed rat after it's been wrapped by the snake's coils, such as pulling gently but consistently, from time to time, on the tail, or an exposed leg, with my tongs further helps to convince the snake that he's killing the rat in his coils. I'm just trying to simulate the actions of a dying rat. After a minute or so of that, I then cover the terrarium with a towel so he doesn't get distracted by what's happening outside the terrarium.

It just seems to focus his mind and give purpose to his efforts.

<><Ciao