At first glance, it looked like a normal hockey hit.
After taking a closer look, the Florida player who body checked Pettersson did it for the most part legally, but then the Florida player uses his upper body strength to follow through with force in bringing him to the ground.
This is the classical "let me body check you to show you up" rather then body check you to get the puck.
He clearly wants to out muscle the much smaller Elias Petterrson to show his physical dominance as an intimidation factor. The psychology behind it is you want to take every physical advantage you can, and if you can put fear into the other teams, you should do it. Especially a skilled player.
If hockey is a physical sport and you are less skilled, why wouldn't you use every possible advantage you could and take advantage of the rules?
So then the conversation becomes do we want this stuff in our game?
In my opinion this should be a 2 minute roughing call (based on the current rules of the game) but now we have a skilled player with a concussion.
Concussions are a big deal. They can be minor to life altering events; as you can experience minor to serious brain trauma as you age. That's the health side.
From the hockey and business side; Vancouver is going to lose a very skilled player. This is awful for Canucks fans as they won't get to watch there new favourite and star player if he's hurt.
I personally don't like the play.