Demons

If someone was thrown into a pit and calls out that anyone who hears him should write a get to his wife (specifying his name and his city), those who hear this should indeed write and send the get to his wife (we assume that he omitted the instruction of giving the get due to the confusion of his situation).

The Gemora (Gittin 66) asks: Is it not possible that it was a demon (who are suspect of evil behavior, such as deceiving people) that issued that proclamation?

Rav Yehudah replied: The Mishna is referring to a case where they saw in him the form of a man.

The Mishnah Lamelech proves that that there were only two people heard the voice, for if there were three people there, a demon would not reveal itself to them. Now, if there are only two people, it must be that one of them is writing the get and signing on it. This will prove that the signature of a scribe together with one witness is sufficient! This would be problematic, for Amoraim below argue on this exact issue!?

Poras Yosef answers that the Mishna can be referring to a case where there were three people there, and the demon would nevertheless reveal itself, because they were far away from each other.

The Beis Aharon writes that in a place where demons are accustomed to be, such as inside pits, they will reveal themselves even in the presence of three people.