[ninty]

From the NHL rulebook:

[quote:060fd]A minor or major penalty, at the discretion of the Referee, based upon the degree of violence of the impact with the boards, shall be imposed on any player who checks an opponent in such a manner that causes the opponent to be thrown violently in the boards.[/quote:060fd]

It doesn't matter if Simon was turning or not, or if he had time to let up or not. At the point of the hit, Simon's back was to him, and his face hit the glass. Boarding.