You could include it as part of the sub EVENT_SAY
Code:
if($text=~/What other NPC?/i)
{
quest::say("Ah, here he is now.");
quest::spawn2(999151,0,0,1722,1556,231,190);
}
The first # is npc_type (create the npc first),then grid # (create grid and waypoints first), then guildwarset (keep at 0),then x,y,z,then heading