It should be noted that the press site credits Darren Moore, so it seems like masked guy really is Vortigan all along: http://www.disneyabcpress.com/abc/shows/once-upon-a-time/episodes/nimue/photos/
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ONCE - Once Upon a Time podcast
Reviews, theories, and talk about ABC's Once Upon a Time TV show
It should be noted that the press site credits Darren Moore, so it seems like masked guy really is Vortigan all along: http://www.disneyabcpress.com/abc/shows/once-upon-a-time/episodes/nimue/photos/