For the discussion, moderator must be on the neutral position.
They do not need to post anything unless it concerns the forum.

If they take part in the discussion, it's feared that their position will not be neutral anymore.
They'll moderate the discussion by locking threads, delete/move/merge posts.

For you to think about;
Moderators must read and monitored all posts made by all users, there're approximately 7700 posts per day.

Can they have to actively discuss at the same time by monitoring posts?

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If there are cases of posts (spam, plagiarism or things that violate the forum rules) you can click "report to moderator".
For specific cases, you can explain with pm moderator

If the case is about fraud, scam project, (problems involving trust and trade). You can make posts on Scam Accusations or Reputation.