Weston Cage had been missing before he went off the hinges and had to be subdued by police last week, and father Nicolas Cage had been trying to find him.
Nic organized a one-man search party in the form of Kevin Villegas - an assistant for Nic Cage for five years and Weston's trainer - to track down his MIA son.
The elder Cage dispatched Kevin to track down the 21-year-old and bring him home last week, which may have triggered the huge brawl between them.
Weston Cage, Nic's son, with his wife Nikki Williams.
Kevin quickly located his target in L.A., but Weston was resistant and aggressive, even threatening to rip of Kevin's "Christian f**king head."
Villegas reported the situation to Nicolas Cage, who instructed Kevin to call 911. When Weston realized cops were on the way, he flipped out.
Kevin, who served with the U.S. military, feared for his life because Weston is a highly-trained fighter. He came Weston with a flurry of blows.
Weston was hospitalized for a mental evaluation after the police arrived and say she may press charges against Villegas in the coming weeks.
His mother, Nic's former girlfriend Christina Fulton, has filed a giant lawsuit against the actor pertaining largely to his care of their only child.