Kinda sounds like bullshit, similar to the allegations against Puig.
If the chick was still flirting with him in text after that, and then suddenly became convinced she had a "concussion" and blamed him, it seems like she's looking to hit someone with deep pockets after experiencing an injury of some sort. It's even possible that this injury occurred after her time with Bauer, and he was a convenient target from which to extract $. It's also possible that they had consensual rough sex, and then she had nagging pain from it afterwards as a result, and decided to call it "assault".
Anyway, athletes like Bauer need to be careful with this stuff. Before having any kind of rough sex, they should establish a chain of text messages where it's clear the woman really wants it. He could easily get this done without the woman even knowing he's doing it to protect thimself... just bring up the subject, and let the woman talk about it. Can't be too cautious with this stuff these days, especially if you're rich and/or famous.