Eichel gave the Golden Knights a 1-0 lead at 1:37 of the first period, scoring short side from the left circle on a 2-on-1.
Norris tied the game 1-1 with a power-play goal at 6:25. He scored with a one-timer from the right circle five-hole on Hill, who did not drop down into the butterfly on the play and left the game immediately after.
Ridly Greig gave the Senators a 2-1 lead with another power-play goal at 10:55.
Jonathan Marchessault tied it 2-2 at 13:32, scoring glove side through the legs of Senators defenseman Artem Zub from just inside the blue line on a rush
Nicolas Roy put Vegas back in front 3-2 at 9:53 of the second period. He finished a breakaway with his backhand on a power play.
Chandler Stephenson then scored a short-handed goal to make it 4-2 at 11:31. He got behind the defense and received a pass from Stone, who took the puck away from Norris, before lifting in a shot from in front.
“We've really been good this year (on special teams). It's helped us win games, create momentum, kind of all the above, so it's something that we're confident in right now,” Stephenson said. “I think it was just a waiting game to get our calls, I guess, to kind of even it up that way.”