Aww Cara that is a cute video, I'm glad they didn't attack your kitty though! In my neighborhood people tend to watch out about raccoons, they're kind of vicious and feisty in my area haha.
The example was that a cat will always hunt and kill a single mouse when in confinement together, but with 10 mice they kill a few and play with the rest and with 100 they tend to just ignore them.