Street Style
You use the urban environment to your advantage, thrashing and bashing your foe and driving it back.
Prerequisite: Str 15, Improved Bull Rush, Improved Unarmed Strike, Power Attack, base attack bonus +4 or monk level 3rd.
Benefit: While using this style, once per round as a swift action when you hit a target with an unarmed strike, you can deal an extra 1d6 points of damage and attempt a bull rush combat maneuver against that target.
Special: You can enter the style stance for street style only while in urban terrain, and the stance ends immediately if you cease to be in urban terrain.
Source: Ultimate Intrigue, p. 92