Suspense - Alibi

Mark has decided that he has no other choice. His business partner, Hannigan, must be eliminated. He was given a phone number of a man named "Barney" who could do the job. Mark called him and was given the address of a small grocery store. He went to the address and found a grimy storefront between a press-while-you-wait tailor shop and a fly infested fruit store. He walked in, noticing the dust covered stock of tobacco and candy that would not have tempted anyone. Mark said to himself "Not much chance of customers disturbing you here". He walked to the clerk and says "I need to see Barney. I phoned him and he gave me this address." The clerk points him to a backroom. Mark knocks on the door. The man in the room says "Come in". Mark asks "Are you Barney?" The man says "So". Mark says "I phoned you yesterday, my name is..." Barney interrupts him and says "Never mind. You wanted a job done, is that it?" Marks say "Yeah". Barney says "You want a short job, or all the way?" Mark looked confused. Barney says "A short job is to scare him, break an arm, or rough him up". Mark says "No, this has to be all the way".