Technique:
Start in Op's 1/2 guard. Op gains two-on-one control via kimura. Immediately drive shoulder into Op causing him to flatten, apply pressure with shoulder to face or slightly stack Op on his neck/head. This should cause him to release the lock or at least compromise his grip enough so that you can free your arm. Gain side control and retain control of Op's arm, step over and sit into arm bar.
Note: make sure to keep control of Op's torso with proper placement of legs, also use knees to control Op's arm.
