I witnessed something very similar with my own eyes 2 summers ago.
It was during Stampede and I was going to pick up my wife and her cousin from the grounds when I saw a guy laying unconscious on the sidewalk with his bicycle beside him. I figured he had crashed, or gotten hit. There was a gentleman walking down the sidewalk towards the unconscious person, so I stopped and turned around to watch and see if he would help.. if he didn't, then I would go back and help. What I saw absolutely blew my mind. The unconscious man was laying across the sidewalk, so the guy walking by literally STEPPED OVER TOP OF HIM, and kept right on walking. I couldn't believe it!
So I did a u-turn and went back to help. Checked for breathing and a pulse right away, and he was still alive. Tried waking him up by talking to him and smacking his cheeks. No response. Called 9-1-1. Waited for the ambulance to show up and explained the situation to the paramedics. They were able to revive him while I was still there by doing the same thing I did, except rougher. Once they had enough information to figure out that I hadn't actually hit the guy myself, they let me go and thanked me for calling it in. Turns out the guy was just very drunk and had "fallen and couldn't get up". I believe the paramedic called it a "stampede special" or something along those lines. haha
To this day, I still cannot get over the fact that the other guy just stepped over top of this man and kept walking! So as appalling as it is, the above article didn't surprise me at all.