Hm. I wonder if the couple was arguing or something. There’s always a little more to the story...
Your argument idea — reminds me of our much missed mini poodle. If my wife and I argued, the poodle would growl at me and my much louder voice.
That was my first thought....Maybe the husband took a swat at her.
Yes, there has to be more to this story. Either they were arguing, the car stopped suddenly so the dog was scared, a bee stung him or the radio was playing rap.
Pit bull. End of story.