I have no idea whether she'd spent the preceding 10 minutes before the video screaming obscenities at him, but it seems unlikely. Even so, there would have been ample time to bark something crude back to her and then move on with the game. Instead, this went on long enough for the husband to get out his phone, start recording, and then get several minutes of video.
Looked like a nasty individual to me. Vulgar insults and threats of violence that persisted. And he seemed to feel quite comfortable that he could threaten a younger adult male in public like that - not sure if he felt emboldened by being among surrounding home team fans.