I am the 5th Remedy Master of dagger for the collar hold of this player. Before he has drawn his dagger, I will break his arm, so keeping his hand to me is to my great advantage, because I can do all the covers and binds of the other Remedy Masters and of their scholars who are before. It is like the proverb says. I want everyone who is a scholar in this art to know that nobody can defend a collar grab without speed.
The situation that the 5th Master finds themselves in is a common one where an argument flares into violence. A lot of shouting, posturing and grabbing precedes the actual attack. The fact that the player has not yet drawn their dagger implies this scenario.
While such application is certainly viable, it could also arise from a far more dynamic situation. The player may have freed one hand from a clinch and is now raising the stakes of a wrestling match by introducing a dagger. The player may have attempted to punch the master in the face to give himself time to draw a weapon, but the master has snatched it out of the air. The player may also have lunged into the attack, attempting a grab and stab in a single motion.
Whatever the circumstances leading into this moment, there is a lot more movement going on here than the relatively static picture suggests. As Fiore highlights, you need to respond with speed.
Your response as the Master is a simple one, but requires an understanding of leverage. By pinning the players hand to your chest, you are creating the fulcrum of a third class lever.
The height at which you pin the hand is less relevant than making sure it attaches to your centerline and stays there. You can and should pivot around it, which is why it needs to remain on your central axis. Most important is keeping the hand still in absolute space. No matter where your body moves, the hand remains in its given place.
Place your right hand against the players left elbow. This is a small movement with your arm. Do not let you own elbow stray from your body.
It is a push, not a strike. The power comes from making a strong and sudden anticlockwise twist of your hips. Whether you twist on the spot, or adjust your distancing by either stepping forward with right foot, or pivoting back with the left, the important thing is that you pivot around your fulcrum.
The elbow will almost immediately start to hyperextend. A gentle push will send the player spinning across the room. You can either direct them into something, or control them to the ground as the 2nd scholar of the 3rd Master of Dagger. A strong push will quite literally rip the arm almost in half.