Are you sure about that? How can you possibly know for sure why anyone gets hurt, maybe he didn't have enough potassium that day and he was tight. Maybe he twerked it lifting weights or lifting a package or a baby and when he threw that day it happened to be tender already. Maybe he was dehydrated. Perhaps it was an act of god. Than again maybe it was mechanics. My point is I hate when people give sure fire responses like they know for sure exactly what the answer is. Give an opinion, a guess, whatever you want to call it, but don't pretend you definitely know the answer to questions you can't possibly know the definite answer to........ And thats what really grinds my gears .
BTW, the whipping action is exactly what Will Carroll from baseball prospectus said caused the injury and I don't personally agree with a lot of the things he says. In the case of injury I don't have an answer so his guess is as good as mine... I guess.