Encouragement may take on many forms, depending significantly on the teacher's own resourcefulness. If a student is very nervous at the start of a role-play, the teacher might stop it for a minute and help the student relax. Encouragement can easily work if the tone is friendly and sometimes humorous. Perhaps it is premature. In some circumstances though, more detailed intervention is useful.
Students can learn much from actually seeing how their teacher thinks in dramatic situations.
They also may obtain some benefits through osmosis. In the development of any course, improvements can be attempted over time. Sticking with any outline for too long might cause a course to become staid. The teacher might grow to accept something which has begun to lose its effectiveness. Other kinds of activities were much more frequent.