ited States v. Leeson, 453 F.3d 631, 638 n.4 (4th Cir. 2006) (noting that late arguments are "unfair to the appellee"); Pignons S.A. de Mecanique v. Polaroid Corp., 701 F.2d 1, 3 (1st Cir. 1983) ("In preparing briefs and arguments, an appellee is entitled to rely on the content of an appellant's brief for the