 Why did the bank robbers end up crashing?
There was Mrs. Dolly Daniels, withdrawing money from her savings account again. The three bank robbers looked like triplets. 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. 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. Two police cars came driving down the block and a half from the precinct house to the bank, and the car with the four robbers in it lurched away from the curb and drove straight down the street toward the police station. There was so much confusion that it looked as though the bank robbers were going to get away after all. Then, after the getaway car had gone more than two blocks, it suddenly started jouncing around. 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. "It was four professional criminals, I thought you knew that.
 The Scorpion somehow melted their tires.
 The cops used incendiary bullets to melt the tires.  The Scorpion somehow melted their tires.  They didn't realize the car they stole was damaged.  It was so hot outside that their tires melted and blew out.