Roy did not save. Roy was affected by a Mind Blank, a level 8 spell from a caster level 17 wizard. Hilgya was affected by a Protection from Law from a wand (caster level 1 unless she paid more than the default price for a wand with a higher caster level and didn't mention it). The vampires launched a barrage of mostly low-caster-level Dispel Magics, the item-based Protection from Evil and Law spells were removed, the Mind Blanks stayed.