Shard hides the barb like hair pin in the folds of his greyish rags. He fondles the two Bobby pins before scrapping the plastic off the ends of each essentially leaving two bent pieces of metal wire.
Here goes nothing...
Looking around to make sure no one was around to witness his success or failure he proceeded.
He finds a small gap in the shockcuff's housing where he imagined the battery and power supply to be. He stuck both pins in hoping to dislodge the wires that carried the power from the supply to the shock emitters.