I was doing Fractals today and noticed that no vulnerability and cripple was applied to the target when I immobilized it. While I activitated a console in atherblades fractal and got immobilizied, vulnerbility and cripple was also applied. When I switched to another trait only immobilize was applied.
So the trait actually applies vulnerability and cripple to myself when someone immobilzes me, which makes this trait worse than useless.