And that is what he should have done (or would have done if he actually wanted to help her). Get her out of the home, even if he had to drive 700 miles, go right to the next hospital with her. And then go from there. I guess they would call the police anyway? If she tells them she was raped by her step-"dad" (that's at least what I probably would have done, hospital first to get experts involved who know a lot better than me what to do and also get her to be checked out health-wise as fast as possible).
And, of course, he should have never asked for the video. He could have suggested that she could film it on her phone if it happens again before he can get there (700 miles plus work) and then she would have more proof than without the video. There was no reason whatsoever for him to ask her to send it to him. If she had it on HER phone, that would have been enough to show doctors/nurses at the hospital and to show LE. He never should have seen the video.
He knows so much about rape kits, etc., so he actually wants people to believe that he didn't know that this video is child *advertiser censored* and that having child *advertiser censored* on your computer is a crime? Doesn't matter why it's there or where it came from. Not in a million years would I ask a child to send me a video like that, even if they told me they already filmed it long before I ever met them but they don't know what to do with it. Even if I don't have to ask to film it, it counts as child *advertiser censored* and you will avoid at any cost that someone sends something like that to you. And if they still send you some file, you don't download it, you don't open it.
This is the reason why I think they will find more child *advertiser censored* on his computer, probably anyway, because he didn't think twice about downloading the video onto his computer, like it was normal for him to have files like that on his computer.