incident with me and him was because he was drunk at a party and he started shouting, swearing on the phone. >> reporter: he describes that incident as beginning when pistorius thought a girlfriend was cheating on him. despite bachelor's size, pistorius wanted a fight. >> he said he's not scared. if i want him to come down there, blah, blah. but i left it, you know. >> reporter: one thing many don't know is that pistorius was armed nearly everywhere he went. he even applied to become a licensed gun collector so he could buy more than the four guns allowed by south african law. just last january, though the facts are in dispute, friend and boxer said pistorius was holding a gun at this outdoor cafe when it went off. he says pistorius was showing the gun to a friend. >> that was a major mistake what happened on oscar's part. it wasn't intentional. that could have been a bad event