Seems to me... That if he'd stayed on his line he'd have been absolutely fine. She was past before he would have been sharing space, and she was so much faster she'd have been out the other side before he was on the power. He panicked... I agree with the folk saying it was a daft pass on a trackday, but I've had worse (from a GSXR thou track bike I'd just passed, total red mist...) and didn't grab a handful of brake- just straightlined the corner and carried on. It's not he standing up that gets him, it's the panic after.
Wonder if she'd be getting the same sort of response if she was a man?