There is one thing that I think should be added to this video. There are a lot of times that people get fixated on one submission from whatever position they are in. They keep on trying the same thing and expect different results from the first time. Typically the second try uses more force and force increases with each attempt. There is one of two things that needs to happen in this situation, either they need to change the angle or application of the technique to pit against different muscles or just move on to something else.