Persuasive writing is a form of building logical arguments along with the emotional appeal. It helps in molding the reader's point of view as per the thoughts of the writer. Valid information is added and the argument is present in the way that it influences the reader.
In the given message, the writer had used the technique of being reasonable and specific. He had presented his problem in a subtle manner along with the proper solution to it.
Doing things like using informal language, ignoring others, and opinionating eithout having recources, are examples of negative communication skills. Whereas Saren's action properly demonstrate how to participate resectfully.