Although it is not official, or even well-publicized, one of the functions of the American Hockey League is rules development, as well as player development. The NHL developed its present overtime format in the AHL, for instance. The game changes as players change and equipment changes.
Rules have to change, too.
That means an opposing power play, and almost any coach would trade the 10 minutes without one player on the bench for the two minutes playing shorthanded. This has become more and more popular in recent seasons. It is hockey's version of the punt, with players just sending the puck high into the air to clear their own zone. The puck does not go far enough to be icing. Hockey is meant to be played along the ice, not in the air, and flipping the puck is a lazy way to clear the zone.