(1) Unless the —
(a) parties agree; or
(b) court orders otherwise,
an appellant who discontinues is liable for the costs incurred by the respondent against whom the claim is discontinued, on or before the date on which notice of discontinuance was served.
(2) If an appeal is only partly discontinued —
(a) the appellant is only liable for the costs relating to that part of the appeal which is discontinued; and
(b) unless the court orders otherwise, the costs which the appellant is liable to pay are not to be quantified until the conclusion of the rest of the appeal.