You know the principles of arcane dueling, and when fighting other spellcasters, you have learned to hide the true nature of your spells until the last possible moment.
Because you have studied how to mask the recognizable elements of your spellcasting, you gain a +2 bonus on your Spellcraft checks to identify and counter an opponent’s spell if it is a spell you know or have in your spellbook.
Pathfinder Roleplaying Game Ultimate Magic. © 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.