and he was like whoa. crystal, a mother of two young sons told weldon her husband was violent and abusive. she said she wanted to buy a gun for protection. so at that point i asked or are you prepared to kill him? because that is a very real possibility. if it s his life, your son s life or your life, then you have to make that decision. after a few moments she said yes, if i have to. he took crystal under his wing. taught her to defend herself even stressful situations. this guy sounds like he was actually looking out for you a little bit? yeah. somebody who s in the business of saving lives and a warrior and a hero and that kind of mentality. yeah, he wanted to help. me at home krystal helped herself used a mini cassette recorder to gather evidence against her husband. oh god, stop.
applied arm lock would get that bully to kiss the street. we didn t have to run from him anymore. reporter: when he grew up, weldon enlisted in the marine corps. after leaving the service he worked as a firearms instructor. a customer walked in. i could tell something was wrong with her. i couldn t tell exactly what, but i could read that she was under some kind of stress. her name was crystal harris. he was like, can i help you? i said i need to buy a gun. i said it s not just for putting it away. my life is in danger. and it s from my husband. and he was like, whoa. crystal, a mother of two young sons told weldon her husband was violent and abusive. she wanted to buy a gun for protection. so at that point i asked her, are you prepared to kill him?
reporter: crystal, a mother of two young sons, told weldon her husband was violent and abusive. she said she wanted to buy a gun for protection. so at that point, i asked her, are you prepared to kill him? because that is a very real possibility. you know, if it s his life, your son s life, or your life, then you have to make that decision. and after a few moments, she said, yes, if i have to. reporter: weldon took crystal under his wing, taught her to defend herself even in stressful situations. this guy sounds like he was actually looking out for you a little bit? yeah. somebody who s in the business of saving lives and, you know a warrior and a hero and that type of mentality, yeah, he wanted to help me. reporter: at home, crystal also helped herself, used a mini cassette recorder to gather evidence against her husband. oh, god. stop. please,