An attachment to an electricity-inducing immobilization cartridge has a body with a plurality of converging sections, a strike plate affixed at a front end of the body and a plurality of hinges formed on each of the converging sections. The hinges serve to allow the plurality of converging sections to fold when the strike plate contacts a target. A barb is affixed to an inner surface of at least one of the sections so as to be movable from the interior of the body to a location exterior of the body when the strike plate contacts the target. Fasteners are provided within the body so as to maintain the body in a collapsed condition subsequent to the strike plate contacting the target.