Straight Arm Lock from Scarf Escape Attempt

Scarf position has lots of submissions just waiting to be sprung on your opponent. I'll start with this simple counter and the next few articles will be from scarf. Drill it!!! Have fun.
Once again, sorry for the clarity... video pics!

• Start

We start off with top man in an open(modified) scarf position.
• Escape Attempt

Joe tries to escape by pushing away at my face. I give him alittle resistance to make him push harder.
• Counter

I quickly sweep my right arm up and over his as he gets near full extension.
• Begining of the End

As I trap his elbow under my armpit, notice that I catch his wrist with my other hand and straighten my right leg.
• Finish

I finish the lock by sliding my hip away from him, drop my right shoulder down on the arm, and pull up on the wrist with both hands. Use your thigh for more force.