One of mt kittens was a little git growling because he had something. He still does growl at the other kitten.
Its quite easy to stop. Distract the cat then remove the object. I clap my hands then take the object away, depending on what it is. It might be his then I make sure the other kitten gets the same for instance a treat. If its a moth then I remove it.
Over 20 years of living with cats never been viciously attacked. Best touch wood now.

Sue