I hear you on the Karambit...it would be a grim event to pluck her from the pocket, the wave catching and deploying the blade while your in a full-power upward swing to an assailants upper torso...followed quickly thereafter by targeted strikes to tendons and arteries....oops, overshare.

The Umnumzann is CRKs answer to critics of the Sebenza not being robust enough. It's nice, I've almost purchased one--no fewer than three times, but always decide against it. Nothing really negative about it, just not right for me. It's a personal choice.