Perhaps the video starts after explained himself, so I didn't hear it. But it seems he could have at least tried to talk his way out of this by denying her accusations. Instead he remains quiet (creepy in her eyes) and keeps on filming. Had he told her what he was doing, shown her the video from the quad, as his mom would say, used his words, this might have been avoided. The again, she's a psycho, so maybe not.