Here's the Torres hit:
Here's the Desjardins hit on Mayers earlier in the year:
https://www.youtube.com/watch?v=CHgT_ccSTA4
The best view is at the 1:58 mark.
Desjardins hits Mayers squarely in the shoulder and Mayers' body goes flying. Mayers' head tilts side to side with the force of the impact, but if you watch carefully, his head really doesn't turn/rotate much. Mayers' nose/face stay pretty much in line with his chest. There is some turning of the head, but it is minor and follows along with his mid-section.
That's what happens when you have solid shoulder-shoulder contact. It's like being in a car crash. Your head may tilt side to side with the body impact, but it will typically remain facing in the same direction as the rest of the torso. Your head isn't going to violently rotate 90* to one side.
Contrast that with the Torres .gif.
Stoll's head turns sharply and it's the first thing to turn. Head/jaw/face rotates quickly to the left, then the rest of the body follows. If it was pure shoulder-shoulder, his face would have stayed mostly in line with his torso, and any head movement would have come as an after effect of the body collision.
Stoll's head turns first, THEN his skate lifts off the ice. Head goes first. It snaps 90* to the left in the same time and direction as Torres shoulder.