Because there was Steph Curry, Durant’s old running mate, his old championship partner, lighting up the night and taking over Barclays Center. There was Curry, as electric as ever, eliciting the loudest cheers from start to finish, scoring 37 points on only 19 shots, draining nine 3s, leading the Warriors to a 117-99 thumping of the Nets. “That,” Durant said, after a stunningly uncharacteristic 6-for-19 night, “is the level we want to get to.”