May my foes' shoes never stay tied or strapped any longer then it takes for them to do so.
May rocks and wood chips fill their slip on shoes so they never take a conferable step.
May only the left sandal straps snap when it is most inconvenient for them.
Let their high heals fail to support their weight when it would be most embarrassing for them to do so.
Fill their boots with brambles so they can never find them all, so the poking may never stop.
Fates worse then death.