No fight between Bob and Cinnamon

Under my watch from 1.30pm till now, Bob has approached Cinnamon a number of times, meowed at her. Cinnamon has hissed and growled. Once Bob went very near under the coffee table, she screamed. I'm mentally prepared to let them fight it out, since I'm the only one at home. I hope noises are all they are going to make when they are under Mom's supervision on weekdays.