One can say it's playoff hockey, but a hit from behind like this is not acceptable. Bouchard was attempting to go for the puck and less than two seconds into his skate he didn't even have a chance. This kind of hit can cause all kinds of major neck injuries and head injuries that are just not necessary during the game.
After a wild three periods, and being down three to nothing early in the first, the Oilers stormed back and won the game 4-3 in overtime.