thoughts in my mind that i heard what i heard, my lady. i didn't need confirmation. >> reporter: on thursday the prosecution laid out the case the night pistorius shot and killed steencamp. >> i built my case to say that when you got up, you had an argument, that's why she ran away screaming. >> reporter: the state's theory, the olympian and his girlfriend had a heated argument in the bedroom and she fled to the bathroom trying to escape an angry pistorius. but the olympian said he feared there was a burglar in his home. >> i didn't intend to shoot. i was pointing -- my firearm was pointed at the door because that's where i remember that somebody was. when i heard a noise, i didn't have time to think and i fired my weapon. it was an accident. >> reporter: the prosecutor unwilling to believe the shooting was anything less than murder. >> your version is so improbable that nobody would ever think it's reasonably possible true. it's so improbable. >> reporter: that prosecutor constantly provoking oscar pistorius.