I'm not sure what causes you to pin an opponent down. Your Stealth Power vs. their Perception or some other stat? Following another attack? I almost always got a pin following another attack, but rarely if it was my opener. I did fail to pin sometimes even on a follow when I didn't have much +Stealth Power get equipped, though.
It looks like this technique can also remove opposing techniques in the following round like Live Wire, with the same message:
<opponent> shakes violently from the electrical current.
After rollover I'll have to try this on a robot.