User blog comment:12th Supernova/Chapter 781: Doctor of Death/@comment-24287735-20150327142401/@comment-24769684-20150329010008

Issho will just say the safety of the citizens took priority over capturing the Straw Hats, which is a completely valid answer although Sakazuki will hate it. Something tells me he'll send Ryokugyu out to finish the job...

As for Joekido's question, I am sure Riku would be more than willing to give the Straw Hats a lift to Zo. Bartolomeo would also be very happy to give a taxi service.