It was at the beginning of the second period, at the score of 1–1, that Djurgården scored three quick goals.
Södertälje never recovered from the shock and Djurgården pulled away to 6–2 before the period was over.
Södertälje's Evan Weinger received a match penalty in the first period after a head tackle on Jakob Ragnarsson, and risks being suspended for the decisive match at Hovet in Stockholm on Saturday.
The winner will meet AIK or Karlskoga in the final, where the winner will earn a spot in SHL next year. AIK leads their semifinal series 3–2 in matches.
Södertälje won the last two matches against the HockeyAllsvenskan series winner (5–0 last) and had the chance to decide the match series at home on Thursday. But Djurgården was the hottest team, won the shot statistics with 46–18, and the match with a five-goal margin.