The new adult male forced the remaining eyass to fledge today at Washington Square Park. 

The mother brought food to the nest, dropped it off, and left.  The male went to the nest, and the mother returned to make sure the eyass could eat.  The new male then went quickly to the Pless roof, at a speed that made it look like it was being aggressive to the first fledgling, who was out of sight but could be heard occasionally.  When the mother went to Pless to intervine, the new adult male went back to the nest. 

I had just arrived at the park, but was able to get my camera out in time to photograph the fledge.