It was nearly midnight in a busy part of Barcelona. Myself and my friend were in high spirits, on our way home to our holiday apartment after an evening out with a group of friends.
The city was humming, its beautiful medieval streets filled with the happy sounds of people enjoying themselves in the warm night.
I was enjoying myself too, in full holiday mode, but I was also on high alert for potential danger. I always am, but particularly when in a foreign city.
Out of the corner of my eye, I spotted a man. He was huge: well over six foot, dressed in shorts and a T-shirt, and wearing earbuds.