This is way too low. This act could literally kill someone.
The punishment is what it is, I think it was about right, anywhere between 5 -10 games.
Keep in mind I am not defending what Kassian did whatsoever but there are a lot of acts in hockey that could literally kill someone, cross checks to the throat, hits from behind(the league is no where near stiff enough on these, should be an auto 5, players are taught at a young age that these are unacceptable).
The odds of someone dying from a skate incident in hockey is actually pretty rare although it does happen, hits from behind and boarding, charging ect are far more dangerous because of the quantity of these types of plays.
If he had got more games that would have been ok with me though.