The creators of the "Star Wars" finally revealed the true reason for which the Rei suffered Skywalker's manhole. When Rei arrived on the planet, she was surprised to find that the hatch is not located to be her mentor. Aged Master Jedi threw strength, accusing himself for the transition of Ben Solo on the dark side. In the end, the hatch softened, but he was clearly very afraid to repeat his mistakes.
In one of the key scenes of "Star Wars: the last Jedi", the hatch with fear observes how Rey is immersed in the puchin of the dark side of power. Seeing this from the side, Luke clearly realized that there was some deep connection between Rey and Kylo Renom, and this fact inspired the hero of the strongest concern.
Recently, Lucasfilm studio published the artistic book "The Secrets of the Jedi", which is notes of Luke Skywalker made by him shortly before their death. In one of the sections, he speaks about the idea of special ultrasound forces that may arise between two people:
Although this ability may seem harmless and even valuable, it is easily manipulating from the Adepts of the Dark Party. Some powerful users of the Forces were able to create secret ties with other users who are not aware of this connection. Subsequently, adherents of the dark side use these bonds to corrupt their visa, managing his actions. Even if such a connection is established against the will, it is still very difficult to break.
This passage in the book is accompanied by a picture with Rey and Kaylo Renom, which there is no doubt that the hatch does not mean. However, in reality, the relationship between Rei and Kaylo was not so simple, because they were a dad of force. This concept is casually explained in "Star Wars: Skywalker. Sunrise ", but subsequent canonical materials confirmed that this is a natural phenomenon created by the will of force.