Describe your set up, first of all.
Temps?
Are you using a UTH? Is it regulated with a thermostat?
Humidity?
I would just feed him in his enclosure. You're just stressing the snake out more by moving it around. Cage aggression is a myth. I feed all my snakes in their cages and have never been mistake for food or have snakes suddenly become aggressive.
Ball pythons out of the egg can eat hopper mice. You are offering too small of a meal. It's a good idea to get a kitchen scale and feed your Bp a meal that is roughly 10-15% of its body weight.
Id try a hopper. Heat it up, and then use a hair dryer to warm the mouses head. If all else fails, you could try live. It will usually get them feeding. If it ate on Friday, wait till next Friday to offer again. If you keep offering it will stress him out.