The Islanders salvaged a point on Frans Nielsen 's late third period goal .
Justin Williams ' score in OT gave the Washington Capitals a 3 - 2 win at Barclays Center on Thursday night .
The Islanders salvaged a point on Frans Nielsen 's late third period goal , but Justin Williams ' score in OT gave the Washington Capitals a 3 - 2 win at Barclays Center on Thursday night .