What does Dr. Roberts say in response to Battle's questions about Shaitana and the other guests?

Dr. Roberts said that he did not know Mr. Shaitana well at all and has little knowledge about his card companions. He does admit to having met Mrs. Lorrimer previously but has never met the other two. Dr. Roberts recalls that he left the table on three occasions and the others did a time or two as well. When asked who he suspected, Dr. Roberts immediately says Despard, for the major is a man used to taking risks.