Then Karlsson struggled along with his teammates in three straight losses when they were outscored by a combined 16-6. He had three assists but was minus-7. He was on the ice for 11 Vegas goals.
Again, the numbers don't tell the whole story. Karlsson wasn't to blame for all of those goals. But some mistakes stood out. He committed turnovers, fell down, got caught out of position and got caught flat-footed at times.
His ice time went from 29:08 to 20:54 and 21:35.
It's hard to know exactly how healthy Karlsson has been, because coaches and players guard that information closely. But after Game 4, DeBoer said Karlsson obviously wasn't 100 percent. And it's fair to say rust has been a factor considering how much time Karlsson missed down the stretch.
"There's rust, timing, all those things," DeBoer said. "I think that's real. But we're going on … What's he played, six now? Last game of the season and five of these games. I think we're probably on the other side of that."
Karlsson had two assists in the Sharks' 5-2 win in Game 5, giving him seven, most in the Stanley Cup Playoffs. He was plus-3 and played 22:20.
The first assist illustrated the fine line Karlsson often skates. He raced through the neutral zone, head up, and passed from right to left across the red line for forward Tomas Hertl, even though Golden Knights center William Karlsson was in between them with his stick outstretched.
The puck squeaked just behind the heel of William Karlsson's stick. Actually, it appeared to glance off of it. That easily could have been a neutral-zone turnover. But Hertl ended up with possession and scored, giving San Jose a 1-0 lead.
"Most of the time, it's mostly on the receiver to be in the right spot at the right time," Erik Karlsson said. "And he was that."