Niklas Kronwall caught Jakub Voracek with his head down. The scariest part was when Voracek was on the ice and his arms were raised. He had an involuntary response, very similar to what we've seen with other major collisions before when people are knocked out.
On a positive note, Howard Eskin reported that Voracek does not have a concussion, but will tested again on Wednesday.
Clean or dirty hit? What do you say? Leave your thoughts in the comments below. Video is after the jump.