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WATCH ABOVE: Florida investigators call bizarre shooting a case of justifiable homicide. WFLA’s Candace McCowan reports.

A Florida teen came out of his bedroom Tuesday morning, rifle in hand, to crying pleas for help. The masked man pointed a gun at his mother and then at him…that’s when the teen opened fire and killed his father.

Eighteen-year-old Malachi Heisler says he was home with his mother, 37-year-old Jolene Andrews, her boyfriend and his younger sister when the interruption occurred.

“I woke up to my name being called, okay. I heard the words Malachi and help, that’s all I heard when I woke up,” Heisler explained to WFLA while a bandana covered part of his face.

The suspect pointed a gun at his mother before turning it on him. Malachi, in turn, was carrying an assault rifle.

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“I had about 5 to 6 seconds to make a decision,” he added. Tweet This

He eventually pulled the trigger and changed his life forever.

Upon closer investigation of the body, which was dressed in swat-type gear with a ski mask — the teen quickly recognized markings and tattoos that belonged to his father, 46-year-old John Heisler, who had a history of drug and alcohol abuse, according to authorities.

A restraining order had been put in place in April after the elder Heisler was handed a felony charge for possession of firearms, according to ABC.

Malachi was questioned at length following the incident and was released hours later when the Pinellas County Sheriff said he wouldn’t be charged, even though the father’s weapons turned out to be BB guns.

“I had a feeling that something like this would happen but I didn’t know when,” Malachi continued. “He wasn’t a good dad, no [expletive] father of the year awards.”