Tribal Hunter

Combat Teamwork

You are trained to take down large prey as part of a group.

Prerequisite: Animal Affinity.

Benefit: When you and an ally with this feat are adjacent to an opponent that is larger than either of you, you both are considered to be flanking the opponent as long as you remain adjacent to it.

Normal: You must be positioned opposite an ally to flank an opponent.

Source: Adventurer's Guide