It was just a filler episode set in an alternate reality. It's actually part of a 'Historical Arc' that was played outside of the regular series, (one was shown in between eps 253 and 254 for example) but some became actual episodes too.
So there's no more real reason than Oda having a bit of fun with his characters ('Chopperman' is another alternate reality arc).
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The most recent episode would be season 4 episode 12 Guilty as Charged. He's shot towards the end and the plot line picks up with the next episode Eyes Open.
Ana Silva goes to Chile and saves the life of this kid who is choking on a piece of meat.
None of the four Law and Order series have an original episode air date of 10/6/09. There is no listing for episode rerun dates. The series title, an episode title, or a brief description of the plot may pinpoint the episode.
It's about an injured RAF pilot who is confined to a wheelchair where he is committed to an eerie hospital. Suddenly he starts to loose his mind.
The world's birds suddenly start attacking humans, and a small group of people must take refuge and try to figure out how to stay safe during the attacks.