Defias in Dustwallow?

My scouts have reported a shipwreck just off the beach to the northeast. Shipwrecks aren't all that unusual out here, but the reports also indicated the survivors were all wearing red bandanas!$B$BThe Defias are craftsmen and guildsmen, not sailors. What are they doing at the site of a shipwreck on a continent they've no interest in?$B$BTheir leader is rumored to reside on a large island just off the coast to the northeast of the tower. Kill him and retrieve any documents you find in his possession.