CHICAGO — For four physical games, Sky forward Kahleah Copper was in perpetual motion. Like a pinball pinging off of any defenders in her way, she bounced off all those she contacted, finishing countless contested layups around the basket, all while pressing an internal turbo button to accelerate past Phoenix defenders who tried stopping her in transition. But with 10.4 seconds to go in Sunday’s Game 4 against the Mercury, Copper meandered slowly to the hash marks surrounding the paint as Courtney Vandersloot prepared to shoot two series-sealing free throws. The 6’1’’ forward was the last of her teammates to get settled in around the line.