I don't like the way that he grabs on his opponent's wrist with his tiger mouth facing toward his opponent (at 1.29).
In MA, you have to think at least 1 step ahead. When you grab on your opponent's wrist like that, your opponent will rotate his arm against your thumb. This will put his arm inside and on top of your arm. That will be to your dis-advantage.
I believe this is because we have lost the original context of the attack... which leads to the attack being wrong, and thus the escape being kind of silly.
As I have been taught, the Japanese swords man wears his sword on his left hip. It is long enough that you can not draw it with your left hand, you must reach across with your right hand in order to clear the sword from the sheath. (sorry about butchering the Japanese names...) When you attack a swords man, especially when you are unarmed, the last thing you want is for his sword to come out.
The attack of grabbing the wrist, is not to hold the wrist and wait patiently to see what the other guy will do. You grab the wrist as if you were grabbing the handle of the sword. The radius should be on top of the ulna, and the radius is in the deepest part of your grip (or tiger mouth). This should give you the ability to be in top, and to control the rotation, as you would control the rotation of the blade of your sword. You use this grip, with their wrist on your centerline to break their structure, usually by extending it behind them and down, sitting them down on the ground, if possible. Always, you keep on top of the radius bone, to prevent that hand from getting across his body to his sword. This means you will put your shoulder into his centerline, so that his hand has to go through your grip, and then through your body, to get to his sword. The idea is to do this at speed, grab the wrist, prevent the sword draw, break the balance and put him on the ground.
The escape techniques, need to be able to deal with that incoming force, to redirect it, and clear the way to get to your sword, while maintaining your feet. You also need to be able to deal with a strong grip. People who fought with swords and other such weapons, develop really strong grips... and they are very good at controlling a length of a stick, that has an oval cross section. (I was training with a kendo player, who had won many kendo championships and tournaments... he was able to grip my wrist in such a fashion, and then point the tip of his sword.... otherwise known as my forearm... at the ground behind me and thrust, landing me on my back side...)
When you look at these escapes... they come in groups. Outside grip, inside grip and two hand grip. The story goes, when you attacked a swords man, the first guy grabs the wrist to prevent the sword from coming out and to try to get him to the ground, while the rest of your guys jump him. You may grab him with one hand, because you have a weapon of your own in the other... you may use both hands, because your guys are right behind you....
These days, we just grab a wrist and hold it there nicely, with no clue what the actual attack is. The grip becomes weaker, the positioning is wrong and wow, there are a lot of things you can do to counter this kind of non-attack...
We do some drills where the one being attacked has a sword in his belt... the attacker has to prevent him from drawing the sword. Then we go modern... and put a knife in the belt or in the gi. Then we put a concealed carry gun on him (obviously a training gun)... always the attacker needs to prevent you from getting your weapon, by controlling the wrist, while trying to take you down. These seem to put a little more life into the grab my wrist so I can escape drills.