If a character wields a second weapon in her off hand, she can get one extra attack or Deflection defense roll per attack action with that weapon. A character who uses the off hand weapon to make an attack loses her Deflection bonus on her next defense roll but retains her Dodge bonus. Otherwise, the character can make two defense rolls with her Deflection bonus, either against the same attacker or against two separate attackers.
The character suffers a -6 penalty with her regular attack and defense rolls with her primary hand and a -10 penalty to the attack and defense rolls with her off hand when she fights this way. Characters can eliminate these penalties with the Improved Two-Weapon Fighting feat.