This can be used to push enemies into friendly overwatch zones or proximity mines. Using the Intimidate skill will let your character unleash a feral shout that knocks enemies out of overwatch mode and causes them to stumble.
Your warcry will strike fear in the hearts of your enemies, as you grow stronger with every hit against you. The goal for the Vanguard build is to set up an Incredible Hulk-esque powerhouse: the angrier you get, the stronger you become.