The weapon Chicken Knife has a "special" ability to force the user to run away from battle every now and then. But, there is a way to trick the game into NOT activating this effect while still using this powerful weapon.
1. You must be a Ninja, Thief with Dual-Wield, OR Freelancer with Dual-Wield.
2. Equip the weapon Twin Lance in your right hand. (Twin Lance is a Ninja/Thief exclusive weapon)
3. Equip the weapon Chicken Knife in your left hand.

Because Twin Lance has the inherent ability to attack twice, you will be attacking a total of three times with this setup. However, the game is tricked into thinking that all the attacks have already been performed, so it does NOT check the Chicken Knife's special ability when it is the third attack. Remember, Twin Lance must be in your RIGHT hand, not left hand, or this will not work.