That is a good point. In a perfect world the turn would not have been made. However, the lane would appear to be clear, given the situation. As seen in the video below.
I found the following video helpful as well, though it doesn't show the blind spot created when the centre lane slows down and a faster outside lane enters a intersection. The truck example shows what would of ideally happened in this case.
Pretty sure if this happened in Alberta or Ontario, this guy would be in jail right now. I did a quick google search for BC and no sites show up regarding being criminally negligent with a motor vehicle. Good news fellas! We're free to speed recklessly through city streets and not go to jail.
http://clg.ab.ca/programs-services/d...iving-offence/
https://www.legalline.ca/legal-answe...al-negligence/