King of the Hill
a Marine corporal accedentally beaned with a baseball bat, hallucinates that uniformed police officer is Viet Cong. He takes the officer's pistol, wounding the cop and Dan Williams. With Williams hostage, he barricades himself in a treatment room.
Prisoner Charlie Swanson takes over the shower building, holding guards and other prisoners hostage. When McGarrett arrives, Charlie demands to be let go or he'll start killing his hostages. McGarrett offers a deal: If Charlie will let the others go, the Five - O chief will surrender himself as a hostage.