y achieve justice for one by working a substantial injustice on another." Walters a City of Atlanta, 803 F.2d 1135, 1149 (11th Cir. 1986); see also Doll v. Brown, 75 F.3d 1200, 1205 (7th Cir. 1996) ("Of course the effect on innocent third parties is a factor to be taken into account in the formulation of an