Seems like a huge delay between the hit and the shock.
But as long as his gun goes down as soon as the hit is registered on the vest I guess that still prevents cheating.
I don't see a cable going from the vest to the gun, does the vest communicate wirelessly to the gun to shut it down when you're hit?
This video shows the placement of the sensors on the vest a lot better and I'm liking what I see. Seems like you'll get clipped if you stick your shoulder out.
Props to matty for being a guinea pig =P