Surprise Strike (Ex)
Source: Ultimate Intrigue, p. 16
The vigilante gains a greater advantage when his foe is unable to defend herself. Whenever he makes an attack against a foe that is denied her Dexterity bonus to AC, he gains a +1 bonus on his attack roll. This bonus increases to +2 at 8th level and to +3 at 16th level. Throat Jab* (Ex): The vigilante’s hidden strike jabs his opponent in the throat, preventing that opponent from speaking until the vigilante’s next turn. (If the vigilante uses this ability on the surprise round, it lasts until the end of his first full turn after the surprise round.) This prevents the target from calling out for help, using spells with verbal components, or doing anything else that requires speaking. The target cannot be affected by that vigilante’s throat jab again for 24 hours. Only a stalker vigilante of at least 4th level can select this talent.