In the garden today, my new kitten and original cat were taking it in turns to chase each other around the garden. It looked really cute, and they weren't hurting one another...just jumping around. But I was wondering whether or not they are actually playing and are getting used to each other? The only other thing is my new kitten fluffs up it's tail and archs it's back...which is a defensive pose...so I'm wondering if he is scared or is enjoying it. But they do take it in turn to wiggle their butts and pounce on one another. Please help!