Dimsdale was a cranky old man who would make wise cracks at Bond through the curtain about Bond's intelligence and so forth. Eventually he pissed off Jimmy Bond so much that Jimmy tried to get out of bed to fight the unknown man behind the curtain. This just led to Jimmy hurting himself a bit as the old man stood over him sneering cruelly. From this point onward the curtain was gone and Jimmy interacted with the old Mr. Dimsdale a lot more. A visit by Dimsdale's son was rebuked as it became clear how much Dimsdale hated his son. "Take care of yourself, you big dope."