Unless you are familiar with behavioral patterns as they relate to emotional and mental abuse they can be hard to spot. I didn't start with the presupposition that BL was an abuser. In fact, I went back and forth through out the video and listened carefully watching for patterns of behavior. One pattern that stood out to me was GP's repeated insistence that she was the problem. A classic victim response called "fawning". Take all the accountability. You're unstable. You're the problem. It's the human equivalent of rolling over and playing dead hoping you won't be harmed further. Couple that with Brian's pattern of denying, accusing and reversing victim and offender (called DARVO) it's a classic mental/emotional abuse cycle. There's other things that show the cycle as well (including Gabby's high emotional state and near hysterics being fight or flight). For what it's worth I also tried to see patterns in reverse and they just weren't there. Someone posted the abuse wheel, might be worth taking a look at.