Throw into Jujigatame – J showed me some important steps to follow in the transition from throw to armlock (or perhaps more accurately, from clinch/roll into the armlock).
Use left hand (usually grabbing lapel), to pin opponent’s left shoulder to the ground. Use right knee on opponent’s chest or stomach. Step over opponent’s head with left leg and apply the lock.
When applying the lock in a class situation it’s obviously important to ensure your training partner’s safety, keep hold of his lapel with your right hand and THEN apply the lock once in the lying position. In a live fight you could obviously drop into the lock in one motion.
Raising the hips applies more pressure to the joint. In order to utilise this effectively, secure the opponent’s arm against your chest as tightly as possible and THEN raise your hips to apply the pressure.
The escape:
Just as the lock is about to be applied, use the pulling action of the opponent to help you twist your body around to your right and slip out from under his left leg. Your head is the last part of your body to escape.
The counter:
Assuming the opponent tries to achieve the mount position having escaped the lock, use your left foot to stop him by pushing on his upper right thigh. Now pull his arm (the right arm which should still be securely in your grasp, off to the right side of your body (across his body) and curl your right leg over his left shoulder and around the back of his head. Secure the leg by hooking the crook of your left leg over the ankle of your right foot. Doing so will apply the triangle choke.