I think he was doing the classic “reverse victim & offender” trick when talking to the police. The witness, Chris, said they were fighting aggressively over a phone and that it appeared as though the man had taken the woman’s phone and didn’t want her in the van. Brian and the officers discussed throughout the video how he had withheld her keys, had put some of her things outside of the van, had locked her out of the van, had shoved her and grabbed her face, and how Gabby had “clawed her way” overtop of him in the driver’s seat to get back in the van. My personal speculation is that he was threatening to leave her on the street with no phone and no vehicle and she was panicking. He knew the phone was a big part of why the fight escalated the way it did and that’s what he started to tell police, but realized he wouldn’t be able to justify keeping her phone from her the way he could the keys so he switched it in his retelling of the story to say he was the one without a phone and that’s why he was withholding her keys, so she wouldn’t drive off and leave him on his own with no means of communication. He was changing up details of the story to make himself the victim on the fly and he stumbled with the lie about not having a phone but the officers didn’t notice.
I posted yesterday that I had noticed for the first time one of the officers in the video saying Gabby had marks on her, too. I don’t know if maybe the female officer photographed those off-camera or if they weren’t documented at all, but the officers were aware that she had some signs of injury. (To what degree, I don’t know. I couldn’t even make out Brian’s injuries on the video, I just know the officers referred to them as scratches.)