Maybe if you apply this to your NPC then it will follow and blow up after a while.
You will need to apply this directly to the NPC because this script does not actually say who to follow the party leader.
object oPC = GetFirstPC();
object oNPC = OBJECT_SELF;
effect eBang = EffectVisualEffect(3003);
effect eKill = EffectDamage(GetMaxHitPoints(oNPC));
DelayCommand(Time Before The NPC Explodes, ApplyEffectToObject(DURATION_TYPE_INSTANT, eBang, oNPC));
DelayCommand(Time Before The NPC Explodes, ApplyEffectToObject(DURATION_TYPE_INSTANT, eKill, oNPC));
You will need to replace:
Time Before The NPC Explodes
with somthing like 30.0 (30 seconds)
Im not a scripting genious but i think (fingers crossed) that will work...