"We are all influenced (either directly or indirectly through its effects on others) when Mercury is in retrograde. What does this mean? Let us explain … Sometimes a planet (or planets) may appear to be traveling backward through the zodiac; this is an illusion. We call this illusion retrograde motion." [Source - Mercury Retrograde Dates 2016]
Let this reality sink in for a moment - with respect to the Cosmos and Cosmic Reality, the backward movement of Mercury through the zodiac is an illusion created by our limited perception as human creatures observing (seeing) it from the surface of the Earth.
Another creature of the Earth, one of my own spirit guides as a daughter of the Romanian Clan of the Old European Y-DNA I2 House of Dracul, the Spirit of Bat epitomizes the mastery of perception. Bats perceive and navigate reality differently than do humans.
Most illusions of perception crafted by illusionists, magicians, witches, astrologers and others who work with the occult are created with the intent to deliberately influence other peoples' patterns of thinking, feeling and responding to any particular circumstance or situation. In many cases, the ability of the illusionist to do this is positive, helping people to break addictions or bad habits, to willfully change undesirable behaviors, to overcome obstacles and blockages, or to draw good energy and abundance into a person's environment by directing willful energy. However, in some cases, the intent of the illusionist is negative, where the illusionist's purpose is to inject harmful ideas, chaotic energy, emotional turmoil or misinformation into the minds and emotional complexes of those they wish to control or manipulate.
Illusion itself is not bad. Illusion is itself a neutral tool of the craft in the hands of those who take it up as such. The goal of a witch is to master the use of the tool, not to be mastered by it. Given that, how a witch deals with the illusion of Mercury Retrograde is really entirely up to her - the witch has the choice to ignore the illusion, ride the illusion or to wield it for magical purposes (be those purposes positive or baneful).
The choice is yours. Importantly, the witch takes full karmic responsibility for all of the choices she makes (either consciously or through not choosing). The layers and patterns of wyrd are woven by our choices. In witchcraft, when all is said and done, there are no scapegoats to ultimately bear the cost of the choices we each make. Magic comes with a price, and each witch must pay the price for the magic she makes.