No penalty was assessed on the play. Johansson, who has a long history of concussions, stayed in the game.
Barbashev, 23, has played primarily in a fourth-line role for the Blues. After a career-high 14 goals and 26 points during the regular season, the former second-round pick has chipped in three goals and three assists in 24 games during St. Louis' postseason run.
Game 6 will take place Sunday at 8 p.m. ET in St. Louis, where the Blues will have a chance to hoist Stanley Cup for the first time in club history.