SO I have a new kitty (here two weeks) and a 11 month old cat and they have been introduced...they are always chasing each other around and then they fight....they older one meows and the little one growles and hisses but they always both go back for more....so I cant tell if they are play fighting or not....they tumble around on the ground and swat with their paws and they each try to go for each others necks with their mouths ...no bleeding so I dont think they are biting or scratching hard...then they run and chase each other a little...and repeat...what do you think?