Skating with your head down is definitely dangerous. Just ask Jakub Voracek.
Voracek took his eye off of where he was headed against the Detroit Red Wings on Tuesday night, and paid for it dearly. Niklas Kronwall levelled him with a huge check and Voracek went down, likely concussed.
Voracek skated off under his own power, but he did not return to the game. The team has announced that he needed stitches after absorbing Kronwall's shoulder with his face, and Voracek will be re-evaluated on Wednesday.
Kronwall, for his part, was not penalized on the play nor should he expect to see any supplemental discipline. The league, apparently, has deemed this hit "clean."