He sets up his tail (զագին) as a cypress tree (40:17)
He sets up his his tail (զտուտն) like the sail of a ship and goes where we wants to go.But also [it refers to] the angel of light and those who are deceived by him, for these are called a tail. It is for this reason that it says in the law of Moses, ‘you will be his tail and not his head.’ (Deuteronomy 28:44) He cautions us lest they believe them to be like the saints.His nerves (the lemma has գիրք instead of ջիղք) are wrapped together (40:17)He means the cunning frauds that are intertwined and are very hard. For just as the nerves and joints connect the members of the body, and the members of virtue are made to fit by the joint of Jesus’ peace and love, so too you should understand the nerves, as Isaiah says ‘I loosen the knots of injustice.’ (Isaiah 58:6). You should not be amazed that since the saints are said to be members of Christ, as He is always with them, that also certain wicked people and sorcerers are [said to be] parts of the serpent.
Stepanos' commentary follows closely the commentary of Olympiodorus the deacon, including the reference of Isaiah:
[Olymp. 361.18-21: His knavery is his nerves. He is full of complication (intertwining) and is hard to dissolve.
There are some people who are like members of Satan and are wrapped together by his nerves. The one who destroys these people’s trap fulfilled the words of Isaiah: ‘loosen every bond of injustice and dissolve the hardening of violent transactions.’ (Isaiah 58:6)]