. >> her name was krystal harris. >> he said, can i help you? i said, i need to buy a gun.that it is not just for putting it away, i said my life is in danger. 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 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. 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. please. please. >> one night, crystal captured something horrible. she said it was audi