RCMP Staff Sgt. Grant Learned said the incident began when a group of teenagers allegedly jaywalked in front of a vehicle Sunday night.
The driver honked at the group and then, thinking that one of the teens hit the vehicle with some kind of object, followed the group to a 7-Eleven store parking lot.
The passenger then got out and began arguing with the teens.
"There was a very heated verbal exchange between the passenger from the vehicle and a couple of people from this crowd," Learned said.
The man then allegedly pushed one of the teenaged girls, and turned on a 15-year-old boy, but the teen fought back.
"The man moved in towards the 15-year-old. The youth swung his skateboard, and hit the man in the head," Learned said.
The man was knocked unconscious and rushed to hospital in critical condition. Learned says the man suffered a very serious head injury and so far has not regained consciousness. His name has not been released by police.
The 15-year-old was arrested and released, and no charges have been laid, Learned said.
"We're still gathering information and details and of course we're waiting to see what the condition of the victim is, as time progresses," he said.