Seeing Double

My family was treated to a show in our backyard at dinner last night. There was a cat on our fence. It jumped down. Then another cat went over the fence. They were probably twins. Next the cats were either play fighting or mating (we couldn't tell which). Then they were facing each other in a sideways position for about 5 minutes. Finally, one went on the hunt. It eventually disapeared from the place that is our backyard. The other cat soon followed. However, the second cat ran in a slightly different dirrection and stared at me before doing so. They were probably trying to kill and eat the nearby rabbit that ran off in the same dirrection as the second cat.