Sources: Dragon #303
Dragon Compendium Vol. 1
When fighting with at least one ally who also possesses this feat, you can coordinate you attacks effectively and threaten your opponent's vital areas.
Prerequisite: Combat reflexes, base attack bonus +6
Benefit: When you and an ally who also has this feat both threaten the same opponent with a melee weapon, the target is treated as flanked regardless of the positions of you and your ally. Targets normally immune to flanking are immune to the special flanking conditions created by this feat.