A bad back can be one of the most debilitating injuries anyone can suffer from. The pain will come in waves and comes out of nowhere especially if the person tweaks or twists the wrong way suddenly. When it hits, there's hardly anything you can do to stop the pain aside from rest and giving the muscles a break.
Whether it's right or wrong, this is the playoffs. It's how teams gain the upper hand on their opponents, especially if their star players suffer from injuries like this. I feel this will continue, we will need to see how to Mark Stone can handle this pain.