Jiu Jitsu 101, maki hiji. Maki hiji basically means, twisting elbow rising.
So he is going to grab on here. Again, I've got to watch to that punch. I've placed my hand up for a block, I don't know what's coming. I'm moving again off the line. I wrap over his arm, underneath his triceps, raising my hand towards the ceiling. As you can see, it's lifting him because it's getting him off balance, putting a lot of pressure on the elbow and the shoulder.
Now from here, take your other hand, grab on to a piece of clothing. Now what I'm going to do is I squeeze his elbow close to my body but I'm pushing my arm out. From here, I can control him. If he raises to punch me in the head, I just extend. I have a really, really good control like this. He cannot pull his arm out, if he goes for it, I just extend.