When the Wizard uses STRAT_MONSTR to get next to any monster
which is carrying the Amulet, he was actually displacing the other
monster to take its map location. It was possible--and still is,
actually, although it takes a lot longer now--for the excessive
summoning by spell casting monsters to entirely fill up the temple
on the Sanctum level, so the Wizard would sometimes knock Moloch's
high priest right out of his temple. And since that priest doesn't
turn hostile until you enter the temple, you might have needed to
kill a peaceful human in order to get the Amulet.
Now when there's no elbow room in the temple, the Wizard will
stay outside instead of bumping the high priest out.