Fictional Worlds

Being small and pathetic seeming, Eowyn (& Merry) are uniquely placed to exploit the Witch King's arrogance.

His single-mindedness about power and his narrow conception of it leads him to not fear any humans - no man can kill him, and the possibility that a halfling and a woman might do it would simply not occur to a mind such as his.

"Do not pursue him! He will not return to this land. Far off yet is his doom, and not by the hand of man will he fall".