Interesting that when resisting saying
why, who and what he shot, OP said that he shot
"out of fright" more or less what Mdunge claimed for shooting his pregnant wife coming out of the bathroom mistaking her for a burglar. From News24, (link:
http://www.news24.com/SouthAfrica/News/Man-who-shot-wife-in-error-can-sympathise-with-Oscar-20140407)
So what OP said about shooting "in fright" on hearing the door opening, a door which has now become the magazine rack being moved, would prove BARD "culpable homicide", especially if the Mdunge case is anything to go by.
Nel's questioning is trying to pin OP down to admitting to intending to shoot an intruder which if he does would place him firmly in murder territory. On the other hand it may be the judge can already take the inference of OP's intent to shoot an intruder from OP saying that he shot at the "perceived danger " when the two are arguably inseparable as one and same thing, i.e. an intruder about to emerge and attack.
IMO, OP's desperate prancing around exactly
what he shot at shows he has been rehearsed on this so he has that help, but Nel is doing no more than what the police would have done had OP co-operated and answered questions at the time, i.e. interrogate him to try to get to the truth. jmo