Do you think the lawyer was gullible? How could he have avoided being taken for a ride?
The lawyer was a young man who started working as junior assisstant clerk soon after he had graduated. Being inexperienced in the profession, he was unsuspecting about people. He was a wide-eyed person. He met Bill at the station and trusted him instantly. Being convinced by his friendly approach, he followed him unquestionably.
If he were judicious, he could have saved himself from being befooled by Lutkins.