Shootout at a Park - S1.E724

Rahul, who is jogging in the park with his friend, collapses while exercising and dies. CID comes in and is stunned to see that he was shot, but there seems to be no one who heard the gunshot or saw the assailant. They investigate and figure out the gunshot angle. They realize that he had been shot from a height. What’s the mystery behind this death?