Z, home from work during this fruitless exercise, tried to help motivate the would-be hunters. Eventually, each cat, in turn, pawed at the mouse. Each cat, in turn, was nipped on the paw. Each nipped cat, aged one to eight years, then refused to go anywhere near the mouse.
This put quite a snag in the training. We tried to corral the cats in the kitchen, near the mouse. They were adamant about not getting within ten feet of that beast. So adamant, they ran out of the kitchen, through any tiny hole in our perimeter! After about a half hour, we gave up. These cats are not hunters.