I cannot explain three shots twice but can you let me know how was it established with certainty that there were shots first and bat banging second? If the defence claims that both sound the same, there could have been easily banging on the door first and shots second.
In addition, I could not believe that the defence during such a trial would use a Youtube test as a demonstration of the fact that gun shots can be perceived the same as cricket bat bangs! Was the defence lawyer just toying with the witness? I hope they will show a proper sound test, which should be done under the same or very close to the conditions at the time of the killing ie inside a house (concrete, brick, wood? walls), open or closed windows, same background noises, same distance, location, obstacles, etc. and proper sound measuring device undertaken by a sound expert.
I'll try.
1) Batman determined that the shots came first, his determination of that was based on the fact that one of the sections of the door that were removed by OP tore through a bullet hole; but his interpretation is minute and does not take in to consideration other facts.
2) Batman determined that the two actual bat strikes were superficial, not strong enough to bash down the door. The removal of the panels was therefore done by OP, by hand, not using the bat.
3) Batman explained that OP inserted the tip of the bat in to a divot or defect that he had made and pried the slender long piece of panel loose.
4) So you have to understand at this point the OP did not bash in the door with the bat. He struck the door twice leaving superficial damage.
5) Nel asked Batman whether or not the superficial damage was consistent with OP banging on the door to "threaten" Reeva, and he resonded affirmatively, yes.
So at this point you should follow that OP struck the door twice to threaten Reeva. Later he murdered her. Following that he pried the door panels loose with the bat and his hands and tore them out.
Going to the sounds.
1) Remember that the bedroom doors were barged beaten through, barged though as well. You need to look at the photos of the bedroom doors. Reeva was on the inside, OP on the outside. There is even a hole that was made by Reeva firing the air gun at OP as he was trying to get at her when she locked him out of the bedroom, and OPs legs look like they went to war on those bedroom doors.
2) Once OP broke though the bedroom doors Reeva fled to the bathroom and locked herself in the safety of the water closet.
3) There is significant damage inside the bathroom. This is most likely where the first set of "shots" were produced. Bashing all of the bathroom with a bat sounded like gunshots to the neighbors.
4) A great deal of time went by, and Reeva was screaming and OP was yelling and mocking.
5) Then there were the gunshots, the second set of bangs; those ended Reevas life.
It is late for me, perhaps I could have written and explained this better or maybe not, but I hope that you follow.
Best!