User blog comment:Ossyria/Grand Line Travel to Blue Seas/@comment-28966845-20160824062523

I think its possible to get back to the blues with the reverse mountain. Mihawk chased Don Krieg from Grand line to East Blue so theres definitely a way to get back. Since the Straw Hats encountered the reverse mountain a bit after that, i think Mihawk and Krieg used the reverse mountain to get back as well.