
PrinceDogWaterIII |

Good question!
Fighting Defensively as a Standard Action: You can choose to fight defensively when attacking. If you do so, you take a –4 penalty on all attacks in a round to gain a +2 to AC for the same round.
Looks like you can drop if you so choose and retain the dodge bonus to AC. I don't know why you would want to drop your weapon after fighting defensively.