William Karlsson responded 53 seconds later for Vegas, redirecting Eichel's shot five-hole on Pickard to cut it to 3-2.
Evander Kane made it 4-2 at 1:52 of the third period. He took a centering pass from Zach Hyman and scored with a shot that hit off the stick of Pietrangelo and the pad of Hill before bouncing into the net.
Olofsson got the Golden Knights to within 4-3 at 4:32, scoring his second power-play goal of the game with another one-timer from the right circle.
“He shot the puck when it came over to the elbow. That's what he does well,” Vegas coach Bruce Cassidy said. “There was a power play in the second period where he turned down shots. We said: ‘Victor, you're there. You and [forward Pavel Dorofeyev] have good releases, good shots on left sticks. They're one-timers, so shoot it. The puck shows up, be selfish in those situations.’”
Pietrangelo, who missed Game 1 with an illness, tied it 4-4 at 11:58 with a wrist shot from the right point that went through the screen of Tomas Hertl and just inside the left post.
“We were pretty urgent,” Stone said. “We came out good again. I thought we followed it in. I actually thought we were playing a pretty good second period, and then we gave up three goals bang, bang, bang, right? But overall, take the good, look at the bad, and be ready. We've got to win a game on Saturday night.”
NOTE: McNabb left the game at 15:03 of overtime after taking a hit into the boards from Arvidsson. Cassidy did not have an update.