JoelR: seems to work. It doesn't lose a tempo, because Black must play before getting on with taking White's liberties, and it costs Black a liberty. It looked odd to me at first, because it looked like White was trying to make eye that was already ruined.
Compare this failure diagram. And at doesn't work, because after at , White is way behind on liberties.
unkx80: Not "way behind on liberties", there is only a difference of one liberty.