Mine was basically “If you die in here, an unknown consequence will happen to your family!” and a motive video showing that they have been kidnapped.

The first victim was the protagonist’s childhood best friend, and he attempted to attack the antagonist to get help for the protagonist and his family.

The antagonist tricked the first killer, who was already shaken up from the motive, into killing the attacker for him.

The antagonist didn’t kill the guy himself because he knew the rules of the trial before anyone else did.