I see it like this at the moment, not sure about first sounds at the moment still wondering about that metal panel in the bathroom, but anyway
3.16/17 Shots fired in a rage
Followed by what he has just done sinking into Oscar, he has no idea what to do next, he runs and shouts help from his balcony, he then telephones Stander, i don't believe Oscar rang Stander to tell him to call an ambulance i believe he rang him in a total panic, i believe Stander told Oscar he will come over and told Oscar to ring an ambulance, so Oscar then phones Netcare, see at this point i personally don't believe the bat has been used on the door yet, so when Oscar rings netcare he has no idea of her injuries, hence them telling him to bring her in, there is no way they would have told him to bring her in if they knew she'd been shot in the head.
The time when the netcare call ends is 3:21:11 at this point Oscar realises he better get the toilet door open, he goes to his bedroom, grabs the bat and goes back to break the door down, he drags Reeva out into the bathroom, he then goes back to his bedroom and put's his prosthesis on(hence unexplained blood in bedroom) and carries her downstairs by which point The Standers and Baba have arrived.
That's my opinion at the moment.