Actually, before she left she already spoke to a few of her companions that they needed salt to survive and explained what they had to do. But now seeing the familiar contraption by the seaside it seems they realized how needed that was.
As the cloud descended she could see a couple of familiar faces together working with many that are not familiar. So she pulled the cloud up as this secret should be not known to many. The saint animal has to be protected by them from now on.
Siu could see her actions and her expression. ''I could see you getting happy but now you look serious. What happened.''
''Few of them are our own guild so I can trust them but others are not familiar. I need to hide your existence in our home. It's better for you, for us and for this world. Please understand.'' She rushed with the cloud away while few men just inked at each other. They saw the cloud but seeing she passed them it seems she came back with her ''Cargo''.