I needed a wide bore cannula to relieve the pneumothorax but the place was a bank not a hospital!, I had to think fast and improvise. I had a penknife in my bag. I always carried it with me just in case . I located his second intercostal along the midclavicular line and made an incision there into his chest cavity. The trapped air rushed out like gas coming out of a bottle of Coca Cola that has been shaken vigorously before being opened. It stopped as sooner as I pulled the knife out. This was expected, I needed something to keep the hole open, ideally a chest tube with an underwater seal. A pen top could do the job too, in this dire circumstance. I grabbed a pen top from one of the numerous ‘chained pens’ in the bank. I jabbed it into the hole and the air rushed out till his left lung expanded enough to enable him breath with minimal difficulty. The next thing was to stop the bleeding. I had no bandages for that, hence one of his comrade...