Oh good gods, people- what is your issue????
Thumping a rat to pre-kill??? Seriously barbaric and potentially insanely inhumane.
Why on earth do something like that when you can just give the live rodent to your snake and allow the normal process to commence???
Some people think that since we have taken the snakes out of the wild then their feeding instincts have changed? Or we try to change their feeding instincts? Oh please. And protect them from everything?? I can't even protect my own kids from everything!! No one has that amount of control; only the illusion of it.
If you fear that a larger rodent would harm the snake, feed multiples of mice. No big deal and not rocket science to figure out.
So, is it fine to thump a snake? No. Use a more compassionate method.