My 6 month kitten came down stairs and started to play. However, it was wary of my other 11 month old cat. They started to chase each other but my littlest kitten, would hiss and growl. They would swipe at eachother, but then still chase and find eachother. After they chased eachother for a while, the oldest cat then jumped onto my kitten. The kitten started to hiss, and growl while they were kicking and swiping eachother. Is this normal? I broke up the "fight" with a spray bottle.Both are neutered and male.