just

Just was sailing on his ship, he stopped for just a second to find out where to sail, when a strange creature, like a fish, like a man, was caught in the net, and a snowy creature from the Arctic Ocean swam to these parts

When Jast cut the nets, he saw not just a fish or a person, but a siren, although he was different from other sirens. It was a guy, whiter than snow and clearly shouldn't have been in these warm climes.