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Opportune Backstab 
Feat 8
Source Pathfinder Core Rulebook
Trigger A creature within your melee reach is hit by a melee attack from one of your allies
When your enemy is hit by your ally, you capitalize upon the distraction. Make a Strike against the triggering creature.
Traits
Common
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
RogueThis indicates abilities from the rogue class.