User blog comment:Monkey D. Fan/How will they beat the Kraken?/@comment-3210489-20101115055942

its clearli stated that haoshoku haki is the ability to overpower the wills of others.. so the effect of haoshoku haki is either be knocked out to unconcious (just like rayliegh), scared off weak wills (just like shanks did to the sea king) or gain control/be tamed by the users.