Perfect description of what happens every night and sometimes dayHas he hurt anyone? Blood scratches? Screaming doesn't count. It's possible he's trying to play and the others don't understand. Watch their body language and his carefully. Is it loose, tense? Cat's play by by play hunting, stalking and fighting with each other. When one goes too hard the other screams for him to knock it off.
Of course they may actually be afraid of him regardless of his intentions.
Are My Cats Fighting Or Playing?