Backfire

He was waiting in his shop. No customer since last Monday. All the money he could save was running out. But the kind of thing he deals in, he couldn't expect many customers. His wife left him years back.
 "You don't do a better work; remember, the evil you sell, will one day return to you. You aid in other's death, some day you will have to live worse than death.". 
Silly woman, tried to curse. She had no idea what a profitable business it was then. In a country like where it is almost a requirement, a compulsion to keep atleast one, my business will flourish, always. He let her go, but did not allow her to take their infant son.
 "He's mine, if you want to go, go alone! Don't ever think of my son." "The devil is taking your mind, you have already sold your soul to him, foul man!". she cursed again. "Go, go away, I had been saving all my life for my family, now you break it. My son shall inherit all. Get lost." He barked. 

"All for my son, son! Son, where are you? Stop playing hide and seek in the shop dear. "
"Find me, father." He heard a giggle in backyard. Smiling, just as he turned to the backyard door, a customer knocked.
Finally, someone after days. The man arrived was tall, well built. rough hair all covered with dust. His clothes were soiled in mud and blood stains here and there. Fierce man. Without saying a word the man came inside and started checking each piece. He tried to explain the models, features but the man signaled him to stay silent. The way that man examined each one,
and was sorting the betters ones, he was undoubtedly an experienced one. Finally he picked up one and said for the first time, "Will this backfire?"
"Never!"
"I want to try."
He gave the man 3 cartridges and led him to backyard. Sacks were piled there and three had bullseyes marked in them. It took the man a few seconds to burn holes in two of them,exactly at the eyes.
"I'll take this."
He was delighted, finally someone picked, it was a pretty expensive. He quickly moved to the counter and asked, "Do you want cartridges too?" The man didn't reply. "Well, umm, then this makes $400." He extended  his hand to collect the money, and with the other he opened his cash box. The very next moment he was shocked. The man was pointing the pistol at him and smiling.
"Thank you sir for the service. You must have noticed my shooting skill."
He was horror struck, frozen. Next few minutes, the man was gone with all the cash."True sir, this doesn't not backfire, or does it, eh?"
A bigger shock was awaiting him. 'Why didn't he cry on shooting sound?' He was reminded of something. "Son..!!!" . He rushed towards the backyard, astonished. The sack was soaked in blood.
'The evil returns ...it will, one day back to you. Worse than death.'