Stoli/Luxor fighting/playing

As of late I've been concerned that Luxor is asserting dominant cat behavior and I'm wondering if two kitties that have been really friendly and very obviously play fighting can change into 'real' fighting.

the fighting lately has seemed a little more rough than usual. should i be concerned?

Sometimes there can be an over aggressive play that may become threatening to the other. When you feel its excessive, step in and stop it. You may have to be as aggressive vocally, loud clap, or chase one, picking them up and or petting doesn't keep it from happening again.

well, guess I'll be stepping in from now on. Why can't we all just get along!