Shell (like others have) are just getting out of a socialist run province that's closed for business, they see no profitable future. The NDP has raised business taxes, threaten a royalty review (uncertainty for business) and added a carbon tax. CNRL has more faith the NDP will be voted out and stay out allowing their stupidity to be reversed and make the province financially viable to invest in again. Only time will tell if Shell got out of a bad situation, or if CNRL got some assets cheap that in the future pay off.