I would think that it is not 'in arms' that you have to be mighty to be feared by the Witch King.
Eanur was strong in arms as well. But he lacked other qualities that make him in the end an easy victim for Witch King. Not so Boromir I it seems.
And look who did deal the fatal blows to the Witch king in the end: A Hobbit in his first time battle expirence and a woman how had to disguise to be allowed to that battle at all. Not what you would call 'mighty in arms'.
It seems that it is more Boromirs being 'a man strong in ... will' that the Witch King feared, since that quality he shared with Merry and Eowyn.
Respectfuly
Findegil
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