Rule 51 Delaying the Game
(c) A minor penalty shall be imposed on any player (including the goalkeeper) who delays the game by deliberately displacing a goal post from its normal position. The Referee or Linesmen shall stop play immediately when a goal post has been displaced.
If the goal post is deliberately displaced by a goalkeeper or player during the course of a "breakaway," a penalty shot will be awarded to the non-offending Team, which shot shall be taken by the player last in possession of the puck.
(NOTE) A player with a "breakaway" is defined as a player in control of the puck with no opposition between him and the opposing goal and with a reasonable scoring opportunity.
In the event that a goalpost is deliberately displaced by a defending player or goalkeeper, prior to the puck crossing the goal line between the normal position of the goalposts, the Referee, at his discretion, may assess a minor penalty under Rule 51(c) (paragraph 1), a penalty shot under Rule 51(d), or award a goal.
http://www.nhl.com/hockeyu/rulebook/rule51.html#c
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