This is easy to say now, and his plan may have been not to go too hard, but once you get in the flow of the game and the defense is pressing into you, you need a burst to create separation. You cant tell a man "dont worry, you cant mess it up any worse by playing" then expect him not to play full speed. Yes, he has some blame because ultimately he should have listened to his body and not the tweets, but Kerr played him like a dog right out the gate. Its clear the plan was to get the last bit of juice out of him before he left and run him into the dirt the rest of the series