One leaves so that others know that they may continue without being observed.
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Give pointers to the student who asks oneself questions, but delay before answering to the thoughtless questions. That way the student will rely on their judgment.
In the making
Time will need to be spent. Seek assistance and clarify the situation by identifying the problems. The others will be of great help in finding a solution.
Proof (Pivot's method)
Dismiss those who cross the line.
One will do things that others could not have done.