Value Points :
John had promised Helen that he would dissuade others from using Ouija Boards. Miss Hinkle was a flirt, wanted to avoid her.
Detailed Answer :
Laura Hinkle was one of his wife’ friends who had been invited to the party. The narrator knew that she was a flirtatious crocodile. He wanted to avoid her company. Secondly, he had been **-warned by the ghost of Helen to dissuade people from using Ouija Boards as they did not let the ghosts take rest. That’ why he hesitated to be a partner during the Ouija Board party.