 What can we infer from the passage that caused Mr. Higgins to go crazy?
[Transcriber's Note: This etext was produced from Worlds of If Science Fiction, September 1961. There was Mrs. Dolly Daniels, withdrawing money from her savings account again. One of the others took the pistol away from Mister Anderson, the guard, and said to him in a low voice, "Think about retirement, my friend." The man who had first spoken herded the tellers, Mr. Featherhall and the customers all over against the back wall, while the second man stayed next to Mr. Anderson and the door. She fell unconscious to the floor, and all three of them ran out of the bank to the car out front, in which sat a very nervous-looking fourth man, gunning the engine.
 He had flunked an exam and was overwhelmed with stress.
 He was no longer happy with his wife hence why he murdered her.  He was tired of his job and didn't want to return.  He was overly tired and delirious.  He had flunked an exam and was overwhelmed with stress.