We filed a demurrer, saying that their Complaint was defective, and they filed an Opposition, saying that the Complaint was not defective, and so forth. We now file a Reply to their Opposition, showing why their Opposition is also incorrect.
This is not a required response, but it is often beneficial, since it could convince the judge to agree with us, and make the Plaintiff re-write the case, or just throw the case out with a dismissal.
Since we don't know what they will say, or how complex the legal issues will be, the minimum for the Reply is $200, and it may be more, which you would pay as a supplemental fee.