If I'm not misunderstood, it goes like this:
SCN xx
REF Target
REF objectref1
REF objectref2
BEGIN ScriptEffectStart
set Target to GetSelf
set objectref1 to activatorRef1
set objectref2 to activatorRef2
;objectref1 will move next to the target
;objectref2 will move 8k feet over the target
;objectref2 will cast the fireball, coming down to the target
objectref1.MoveTo Target -500, 80, 0
objectref2.MoveTo objectref1 0, 0, 8000
objectref2.Cast Fireball objectref1
END
Kinda works, but if your AOE on your spell is too big, you'll end up having multiple activators being cast at ALL targated npcs, and therefore each will receive the same amount of damage, as they are always the same distance away.