You’ve learn to chain different tier 1 weapon skills with an ally.
Prerequisite(s): Any tier 1 weapon skill feats, BAB +5.
BENEFIT
At the end of a round of combat, if you or an ally with this teamwork feat starts a chain by using 2 or more tier 1 weapon skill feats will activate this feat automatically, causing the target creature of the weapon skills to take 10 points of non-elemental damage per weapon skill used during the round, no save.