Strange ... the pdf I have matches what you say, but my print copy does not.
Anyway, from the print version:
Unbalance Opponent (Expert or Warrior)
You are skilled at keeping an opponent off-balance. Each round, choose one opponent. If that opponent makes a melee attack against you and misses, he loses his dodge bonus for the next round. You can select a new opponent each round or continue to keep the same one off-balance.
I believe this is the latest/greatest to fit the True20 rules.