Opportunist (Ex)
Replaces: This ability replaces the maneuver training gained at 11th and 19th levels.
At 11th level, once per round, a snakebite striker can make an attack of opportunity against an opponent who has just been struck for damage in melee by another character. This attack counts as an attack of opportunity for that round. She cannot use this ability more than once per round, even if she has the Combat Reflexes feat or a similar ability. At 19th level, she can use this ability twice per round. This ability replaces the maneuver training gained at 11th and 19th levels.