Board Thread:Suggestions forum/@comment-25012056-20170310224811/@comment-29773086-20180504222536

After reading the passage you refer to, it's clear that Boromir's statement that the Men of Gondor have not before felt the power of the Nazgûl is erroneous, probably because the Nazgûl have not attacked in recent memory so they have been forgotten by the Gondorians. The last sightings of Nazgûl were hundreds of years before Boromir's birth- and he is no historian. Another explanation is that Tolkien simply forgot about Gondor's long history of fighting against Nazgûl when writing this chapter. It's not at all far-fetched to say that a Nazgûl led the earlier attack on Osgiliath many hundreds of years before, and therefore it is not possible to say it is "undeniably canon" that Black Uruks used Morgul blades.