At 4th level, a strangler can instantly render a pinned opponent unconscious. This works like the knockout ability, but requires a successful grapple combat maneuver check against the pinned opponent and does not have to damage the opponent. Creatures that do not need to breathe, are immune to critical hits, or are immune to nonlethal damage are immune to this ability. At 10th level, a strangler can use this ability twice per day. At 16th level, she can use it three times per day. This ability alters knockout.
