perhaps he was just beta testing one of his new startups for a smartphone app that uses rfid readings of oyster cards in close proximity for identifying other members of a dating site only it wasnt going very well so he was trying to improve the test results by minimising the distance between cards and the reader (which due to its top-secret prototype nature he had to keep obscured in his trouser pocket)
perhaps he was just beta testing one of his new startups for a smartphone app that uses rfid readings of oyster cards in close proximity for identifying other members of a dating site only it wasnt going very well so he was trying to improve the test results by minimising the distance between cards and the reader (which due to its top-secret prototype nature he had to keep obscured in his trouser pocket)