question:  Why did the teenagers in the schoolyard all throw their weapons away at the same time?
context: 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. 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. Meanwhile, Mr. Anderson went scooting out the front door and running down the street toward the police station in the next block, shouting, "Help! 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. 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. The police cars and the getaway car passed one another, with everybody shooting like the ships in pirate movies. 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. And all the police went running down there to clap handcuffs on the robbers when they crawled dazedly out of their car. Except that in the trunk lid the owner had burned in 'The Scorpion' in big black letters you could see half a block away." "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.
output:  The weapons became too cold to touch.
options:  The police were coming and they needed to get the weapons out of their possession.  They didn't want the approaching children to see them holding weapons.  Judy was a suitable lookout and kept them distracted by yelling, "Fuzz!"  The weapons became too cold to touch.