Chandler Stephenson appeared to score for the Golden Knights on the power play at 2:36 of the third period, but it was determined by video review that the puck did not cross the goal line. Drew Doughty, though, was penalized for delay of game for dislodging the net, but the Kings killed off the subsequent two-man advantage.
"To come out of it unscathed, 5-on-3 for that amount of time (1:31), was desperately needed," McLellan said.
Nosek cut it to 2-1 at 16:33 of the third. Petersen made the save on his initial shot, but the rebound went off Nosek's chest and into the net.
"I don't think even in the third period we got enough of a push," Vegas forward Reilly Smith said. "They did a good job keeping us to the outside, and their goalie made big saves."
Jeff Carter scored on a breakaway set up by Andreas Athanasiou and Walker at 17:28 for the 3-1 final.
"To have [Carter] and Athanasiou execute that play and score, I'm sure it takes a lot out of the opposition," McLellan said. "It gives us a little bit of breathing space, puts them in a situation where they've got to pull the goaltender again, and just a lot more comfort."
NOTES: Kings defenseman Olli Maatta did not return after an upper-body injury sustained in the first period. With Maatta out, four Kings defensemen played at least 20 minutes, led by Doughty's 30:08. … Kopitar has six points (one goal, five assists) during a four-game point streak and has scored 14 points (five goals, nine assists) in his past nine home games. … Brown's goal was his eighth on the power play, tied for third in the NHL behind Dallas Stars center Joe Pavelski (10) and Edmonton Oilers forward Leon Draisaitl (nine).