You are ever the opportunist.
Benefit(s): When an ally with this feat fails a disarm combat maneuver check made on his turn against a foe that’s within your melee reach, you can make an attack of opportunity against that foe. If that attack of opportunity hits the foe, you can also attempt a disarm combat maneuver check against that opponent as part of that attack of opportunity.
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.