I understand some peoples fight or flight instincts are different, but come on. His head was just sitting there, and they did some fruity pat to his shoulder? Just take a few run up steps, and kick his nose to the next block.
Aside from that, Pull out said gun, aim in a direction with no bystanders behind, slightly aimed toward the ground, and blow his brain on the sidewalk D:. But oh wait, that country probably makes it illegal to protect yourself with a gun, so you can watch people get stabbed to death.