A round about way of doing it would be to have the mob set a temp global with the persons name who spoke to them as the value. Make sure you put this command BEFORE the depop command or it may result in errors.
and then when the mob spawns
Code:
sub EVENT_SPAWN
{
quest::attack($qglobals{TempGlobal});
quest::delglobal("TempGlobal");
}