The wounds you inflict with your unarmed strikes bleed, giving you renewed vigor.
Boar Style seems to deal 2d6 bleed damage, which by the normal rules of bleed damage would apply each round, but then Boar Shred, which requires Boar Style and a much higher level, deals 1d6 bleed damage and specifies that it happens on each round. Did Boar Style mean something else?
Yes, Boar Style means to say that it deals 2d6 additional damage once when you hit a foe twice, similar to the rend ability, and then Boar Shred actually does 1d6 ongoing bleed damage. This will be reflected in future errata.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.