This is the first play of grappling and every grappling guard can arrive at this play, and in this grip. Namely, take the left hand inside his right elbow and the right hand up behind his left elbow. Now immediately make the second play, that is, having gripped him in that way I give a turn with the body and he will go to the ground or else his arm will be dislocated.
The player grabs with the left hand to the neck and the right to the hip in an attempt to roll into a lock or throw in either direction.
As the master you need to jam the players right arm in the crook of the elbow. Step either forward or backward dependant on distancing, twisting the hips anticlockwise and removing the target from the players hip grab.
The players left hand arm is also blocked above the elbow. You need to push with the inside of the forearm upward into the opponents triceps. Your forearm should not be directly vertical. Be sure to move your elbow inside the line of the hand, allowing the inside of the forearm to push upwards.
You are not stopping the grab from arriving, but rather, taking control of the momentum in the instant it arrives. Tense your neck a little to help with leverage. The same hip twist which moves your left hip back, pushes your right arm up. Using the grab point as a fulcrum, you have just created a third class lever. Contacting the players arm in this way will create a small shock in their elbow.
Tempo is important. The leverage needs to be applied in the last moment of the players reach, not before it arrives, nor after they have completed the grab. If the grab is completed, the player can anchor their arm and resist, causing the play to devolve into a match of strength.