The number of subordinates gathered at the dock by the One-eyed People wasn't small.
Because they had captured all the crew members on the Adrestia, about thirty or so people.
To keep watch over so many, the One-eyed People stationed a lot of subordinates here.
Moreover, it was probably to let more people witness Barnabas's miserable state, intimidating everyone to not mention words like 'One-eyed.'
Thus, after the One-eyed Person 'lost' his beloved Obsidian Eye, about twenty strong and powerful thieves surrounded Cassandra and Lann.
They were long accustomed to living by licking blood off the blade edge.
No matter how extraordinary a person is, as long as they stand on the opposing side of the battlefield, they don't care if it's a demigod or a hero. If they can cut them down, they're mortal; if not, their own life is at stake.
No need to overthink it.
Most of these were ordinary thieves, much like those two who went to Cassandra's house to stir up trouble.
