Be careful here.
I equate this line of -10.5 goals to a college basketball game where the favourite is favoured by 35 points.
WHO will lay 35 points? 8 out of ten people that see this spread will say "Wow, I'm taking the underdog there, I don't care who is playing, nobody should be favoured by that big a margin."
It's all about perceptions when you get into huge spreads like these. We all know that Vegas sets lines NOT as game predictions, but to try and get 50% of the action on each side. So, in order to try and get 50% of the action on the heavy favourite, they actually have to come up with a false line (lower than it really should be) to try and encourage some favourite bettors.
When I see a college basketball favourite of 30 or more points, I add at least 5-8 points to it to see what I feel the real spread should be. And in this hockey game, I feel the "real" line should be about 14-15 goals.
Canada wins 15-0.