We have not heard any mention of that yet. My guess is that after the bat hitts some parts of the door was partially broken but still on the door and two shots was thru that broken portion and two shots thru other remaining part. OP then
pushed the broken panel to the floor and grabbing the key which was inside on the floor , opened the door .JMO
I'm just wondering if it has been positively established that the cricket bat was used after the gunshots vs. before the gunshots. All gunshots appearing within the remaining door would neither support nor undermine OP's claims, but gunshots through portions of broken off door would support the claim that the bat was used after the gun was fired (though it wouldn't rule out the possibility of the bat being used both before and after, I suppose).
Given that Nel has stated he is not proposing there were two sets of gunshots, along with his assertion that the State believes Reeva was killed by the shots at 3:17, I wonder if he has theorized the loud noises just after 3:00am were sounds of the bat on the door. Or has Nel already stated he does not plan to dispute the claim that the bat was used only after Reeva was shot? If Nel has already stated he will not dispute that part of OP's account, I apologize in advance for wasting everyone's time with these questions.
As always, all of the above is just my opinion.