This will usually be the great difficulty of the operation.
Let him speak to such figures, and insist upon being answered, using the proper pentagrams and signs, as previously taught.
Thus a hostile being may appear clothed with glory; the appropriate pentagram will in such a case cause him to shrivel or decay.
It might be dangerous to go too far, or to stay too long; for fatigue must be avoided.
The danger spoken of is that of fainting, or of obsession, or of loss of memory or other mental faculty.
It may be added that this apparently complicated experiment is perfectly easy to perform. It is best to learn by "travelling" with a person already experienced in the matter. Two or three experiments will suffice to render the student confident and even expert. See also "The Seer", pp. 295-333.