Talk:Sword Art Online Episode 15/@comment-5629533-20121017072834/@comment-209.254.156.116-20121017074137

The picture taken from players in ALO (as a hot news) and Agil happen to know because he's interested in VRMMO, I think they will explain it in the next ep.

SPOILED ALERT :

These players contain 5 people on piggy-back fly up to the top of the world tree (as fly duration is limited in ALO) and take that picture

Source: Light Novel