This is the thing for me -
In order for me to buy any version of Oscar's stories I'd first have to be willing to believe that Oscar believed an intruder climbed a ladder, gained entry to the master bathroom from a sliding window, then chose to immediately lock himself into a toilet closet. WHY? As Nel pointed out, intruders don't break in and lock themselves in a toilet closet. It doesn't pass the sniff test.
But I digress....let's assume Oscar is being honest & really thought it was an intruder for whatever reason that locked himself in the toilet closet. He admitted that there was another option - he & Reeva could have escaped out of the bedroom. MAJOR, legally speaking. Instead Oscar chose to arm himself with a firearm loaded with black talon exploding bullets and approach the door. He STILL could've opted to fire that weapon into the ceiling, out the open window, (wherever there wasn't such immediate imminent danger to a life) he then could have chosen to warn the intruder not to move or he would shoot through the door. Oscar would have had that intruder trapped. He knew what that weapon loaded with black talon bullets would do. He had no reason to be afraid. He could've called the cops while he had the "intruder" trapped in the toilet closet.
That's just one example of so many.... Oscar's history of trouble with others, his history of irresponsible, reckless handling of firearms, the fact that had been exposed to firearms since he was a very young and very well aware of their danger... I'll stop here because I could go on and on and on...