It is barbaric and inhuman and you have NO BUSINESS feeding pre-killed or f/t if you cannot euthanize the prey HUMANELY which means CO2 or cervical dislocation.
Owning snakes means having respect for the prey item also, wonder why people look at us snake owners the way they do, look no further, throwing rats on walls, bashing their hear several times on a table, using hammers, pulling teeth etc.....such a positive image
Learn to dispatch the prey and maybe people will refrain from bashing, educate yourself https://www.avma.org/KB/Policies/Doc...euthanasia.pdf
As for braining it is done post mortem so I fail to see why at this point you want to do this humanly when you fail do do the rest humanly???