The charges are BS. First of all, the GPD officer would have thrown the book att Brantley the first time round if not. I couldn't see the video. What is described here is her walking away with few signs of the types of injuries that are consistent with her account. That is not being knocked unconscious. Also first news report said she was treated for minor injuries at hospital, or something to that effect.
I think it more likely that mayber since the woman's story so radically contradicted the first report, a superior office for some PC related reasons and or rules they have about figuring out what to do with domestic violence, advised a different report just to protect the GPD legally(?) or its image, just in case.. I'm basing that only on what I have read on boards that there was a report that named him as the aggressor and had a different version. I don't know if that's true or if the press just ran with the alternate account.
The other procedural thing I was told about ACSO , and I don't know if it applies to GPD, is that in cases of family violence ( like 2 men), in which 2 parties are claiming the other was the aggressor, the investigating officer has to make an arrest, and it is customary according to what I was told , if it is not clear who is telling the truth, to arrest the person who shows the least injuries, then let the SAO and court system sort it out. I don't know if GPD had a guideline similar that someone wanted to apply to this incident even though it wasn't a family situation.