Maybe ray wants to master the shocking secret of the holy grail alone. Lei Tibin is an expert in the study of the Holy Grail. He will definitely want to get the real holy grail after studying all his life. In addition, Lei Tibin hates the Vatican, Rome, and those Catholic organizations. He thinks that he has betrayed the curator of the Holy Grail. Because he estimated the safety of Sophia, he set a killing trap. He wants the secret of the Holy Grail to be made public, which should be one of the reasons why he is eager to get it. If he doesn't keep the Holy Grail for himself, Langdon and Sophia may not allow him to reveal the secret.

It can be said that Retibin lied to Langdon because he concealed the fact that he set up a game to get the Holy Grail (Langdon and Sophia will go to Ray's manor, which was also designed by Ray).

It can be said that Ray didn't cheat Langdon, because in the whole process, Ray could kill Langdon and Sophia at any time, but he didn't. No, because Ray found that the password on the "box" was too complicated and might need the help of Langdon and Sophia to open it. (See the dialogue between three people in Westminster Abbey). Personally, I think Ray cheated Langdon. He didn't take the box at once, just because it was difficult for him to decipher the code on the box himself.