Jimmy didn't get up to leave; his coffee had just arrived, and standing up to leave right away would seem unusual, not to mention a waste. Although it was getting late and coffee might affect his sleep, Jimmy slowly finished his coffee while casually reading the newspaper that was beside him.
When Si patted Jimmy's shoulder, he used considerable force, a clear sign that his mood wasn't as relaxed as his expression implied. Jimmy could roughly guess his intentions. Si might have misunderstood that he didn't want to disrupt Jimmy's case by taking revenge according to their criminal world rules. Now, the favor fell on Jimmy to return.
After finishing his coffee and watching the waiter clear away their cups, Jimmy stood up to leave. At the door, Jimmy took out a cigarette and a lighter, lit the cigarette, and then set the map piece on fire, dropping it on the sidewalk to watch it turn to ash before heading to his car.
