That's all scripted in the quests. Example: In quests/soldungb open up the player.pl script and you will see it in there. If you want to simply disable that, rename the player.pl to player.bak (or something).
Code:
sub EVENT_TARGET_CHANGE {
if (($client->GetTarget()->GetCleanName() eq "Lord Nagafen") && ($ulevel > 52) && ($status < 80)) {
quest::ze(0,"I will not fight you, but I will banish you!");
$client->MovePC(27,-64,262,-93.96,0);
}
}