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This fire alarm down, went back into his unit here, then he grabbed his guns and went after one of his roommates who fled into the bathroom. that roommate called 911. >> my roommate just pulled a fire alarm and he's got a gun out. >> reporter: you said he never made eye contact with you. >> he made eye contact with me when he pulled the gun on me. that was the best eye contact i ever had with him. looked me dead in the eye. he just raised the gun. >> reporter: police say the roommate helped prevent a massacre. they say the shooter left behind a checklist planning every step of the attack. last...

Out so he could get students in the hallway and slaughter them. the suspected shooter pulled this fire alarm down, went back into his unit here, then he grabbed his guns and went after one of his roommates who fled into the bathroom. that roommate called 911. >> my roommate just pulled a fire alarm and he's got a gun out. >> reporter: you said he never made eye contact with you. >> he made eye contact with me when he pulled the gun on me. that was the best eye contact i ever had with him. looked me dead in the eye. he just raised the gun. >> reporter: police say the roommate helped prevent a m...