When the animal you’re lashed to charges, you use its momentum in your own attack.
Benefit(s): Whenever you’re lashed into a horn harness and you ready an action to make a melee attack against the target of a charge made by the creature you’re lashed to, you gain the attack bonus for charging and your attack deals double damage (or triple damage with a lance). This benefit does not stack with the benefit of Spirited Charge.
Pathfinder Roleplaying Game Monster Codex © 2014, Paizo Inc.; Authors: Dennis Baker, Jesse Benner, Logan Bonner, Jason Bulmahn, Ross Byers, John Compton, Robert N. Emerson, Jonathan H. Keith, Dale C. McCoy, Jr., Mark Moreland, Tom Phillips, Stephen Radney-MacFarland, Sean K Reynolds, Thomas M. Reid, Patrick Renie, Mark Seifter, Tork Shaw, Neil Spicer, Owen K.C. Stephens, and Russ Taylor.