Like all good prophecies, Glorfindel's was more complicated than it looked at first sight, and had more than one possible interpretation. Most people, and presumably the Witch-king, thought it meant 'man' in the general sense i.e. any mortal being, member of 'mankind'. At the Pelennor the prospect was suddenly raised of a more limited meaning - not by the hand of any literal Man (adult male human). Eowyn and Merry were both part of 'mankind', but the Witch-king suddenly realised the loophole, hence his worried pause. In theory, other non adult males could have contributed to his end as well - a male child, for example.
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