$npc->CastSpell(spellid,targetid) should work to target an individual.
examples:
$npc->CastSpell(6646, $npc->GetHateRandom()); // DT random hated client
$npc->CastSpell(15236, $npc->GetHateDamageTop()); // slow client that has done the most damage
$npc->CastSpell(9051, $npc->GetHateTop()); // nuke most hated client
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