This person had a gun on him. He was in the same group as the two armed staff who blocked the four of them at the start.
The foreman probably didn't know that two people from his security officer team had sneaked in. If not, he would have guns on him too.
As for why the foreman didn't listen to the security officers outside about calling the police, it could only mean one thing. He also knew that there was something wrong with this freighter. It could even be said that he was in charge of security for this freighter to earn high profits.
This kind of service could be called 'carriers'. All the relevant procedures were legal, but there were people doing illegal things behind the legality. The foreman was providing security for these illegal things.
Everyone knew what was going on.
Soon, the empty spot in the middle of the container became quiet again. A man looked around and walked toward the spot where someone fell into the water.
