Guild Wars 2

The “Attack of Opportunity” buff generated on the Ranger by using the Marksmanship Grandmaster Signet of the Beastmaster trait combined with the active use of Signet of the Hunt does nothing.

Its supposed to provide a 150% (i.e. +50% more damage) damage on next attack. The buff works fine for the pet.

Tested in the Mists on a PVP test Golem.
Build was:
30 Marks (with I, X, XI skills)
25 Skirmishing (with VI, X skills)
15 Beastmastery (VI skill)
Medium Armor of the Ranger in all slots.
PVP soldier’s amulet
PVP steady Longbow
PVP steady Greatsword
Skills of Healing Spring, Signet of the Wild, Quickening Zephyr, Signet of the Hunt, Rampage as One.
Power 2139
Crit chance 24%, Crit damage 33%

Against a heavy golem I was seeing the same 308 damage for a flanking Maul attack on crits (using opening strikes) with and without the “Attack of Opportunity” buff.

Similarly using in the middle of an attack chain did not change any of my attack damages (it was either crit, or normal damage). Base maul damage with this setup was 153, so a 50% bonus of 75 damage would have been very noticeable.