Twice I recall Paul getting physical with her.
First time was in their old apartment. Leora was going bonkers about something. She was extremely agitated. Consensus at the time was she may have been on (or off) medication. Paul didn't argue back very much but there was a point where for a couple seconds, he grabbed her by the right bicep and sat her down (on that butt-ugly orange couch). She then calmed down and Paul listened to what she had to say. About an hour later Leora opened the couch, put some bedding down and they fell asleep.
Second time was about 24 months ago. Yvonne was still a pup (they got the dog about 2 months before they moved) World War III (or so it seemed) broke out. They were yelling at each other for a solid 20 minutes. Yvonne went AWOL - couldn't find where she was (maybe hiding). Leora was hysterical, waving her arms in anger. Paul grabbed her by the forearms (face-to-face) to calm her down. It kinda worked. He eventually walked out of the apartment and was gone for a couple hours. Leora sat in the GR. Upon his return, things were civil and they started talking in normal tones.
Other then these two incidents, they get along fine. An argument every once in awhile but nothing out of the ordinary that any couple haves't done before.