Upper Body, Lower Body, What is the big secret?

They even do this for goalies, and I think that is plain silly. I guess I can see that if he's injured one of his hands or arms, an opposing player would finds out and might shoot for that injured side in hopes of it being weaker. Who's going to tee off on a goalie though? There's either going to be a penalty for doing so or the other team is going to physically retaliate right after, as they always do. I've never seen any team, in the modern NHL, have guy after guy run a goalie because he's injured. This season though, goalie injuries have also been super secret (like Fleury's).