I filed an unlimited civil case in superior court. In their answer the defendants list an affirmative defense called “Additional Affirmative Defenses” pleaded as follows: “These answering defendants presently have insufficient knowledge or information upon which to form a belief as to whether it may have additional, as yet unstated, affirmative defenses available. Accordingly, these answering defendants reserve the right to assert additional affirmative defenses in the event discovery indicates that they would be appropriate.” It seems silly to consider “additional affirmative defenses” an affirmative defense in itself. More fundamentally, I thought that a defendant could only plead affirmative defenses once, if not lose them later. Plus, I’ve never heard of affirmative defenses being raised after discovery. If so, what is the proper objection to such an affirmative defense?