As has been previously noted on these pages, we play with the boys regularly in the evening, especially having Billy chase wanded toys up cat towers. Oscar and Whitey will join in, but both pretty much stay on the floor or the bed, and don't focus on the prey nearly as well.
But last night, while I'm flicking a feather up a cat tower, who should appear but ... Oscar. And not just awkward clamber up the tree, but a bound from floor to crow's nest so fast I thought it was Billy. And he was focused enough to chomp down the the cat toy and try to take it with him. He succeeded taking the prey down to the floor at least a couple of times, just like a big boy.
Someone has clearly been studying how Billy hunts (and likes feathers in the manner that Billy prefers pom-pom prey.)
We need to encourage this.