 What can we infer from the passage that caused Mr. Higgins to go crazy?
CALL HIM NEMESIS By DONALD E. WESTLAKE Criminals, beware; the Scorpion is on your trail! [Transcriber's Note: This etext was produced from Worlds of If Science Fiction, September 1961. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] There were Miss English and Miss Philicoff, the girls in the gilded teller cages. There was Charlie Casale, getting ten dollars dimes, six dollars nickels and four dollars pennies for his father in the grocery store down the street. 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 third one, who carried a black satchel like a doctor's bag, walked quickly around behind the teller's counter and started filling it with money. 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. Meanwhile, Mr. Anderson went scooting out the front door and running down the street toward the police station in the next block, shouting, "Help! The man with the satchel came running around from behind the counter, and the man by the door tried to keep Miss English from scratching his eyes out. 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. Everyone except Miss English ran out after the bandits, to watch. The police cars and the getaway car passed one another, with everybody shooting like the ships in pirate movies. Then, after the getaway car had gone more than two blocks, it suddenly started jouncing around. "What I can't figure out," said Stevenson, "is exactly what made those tires do that. They're free and clear, barrelling out Rockaway toward the Belt, and all at once their tires melt, the tubes blow out and there they are." Except that in the trunk lid the owner had burned in 'The Scorpion' in big black letters you could see half a block away." On the way around, Stevenson said, "I believe you reported the car stolen almost immediately after it happened." "If I'm making just a quick stop—I never spend more than five minutes with any one customer—I always leave the keys in the car.
 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.