In reviewing the play on a video posted on the league's website, NHL disciplinarian Brendan Shanahan noted Kaleta shoved a defenseless player from behind.

WSJ: NHL suspends Sabres RW Kaleta 5 games for boarding

The replay official must have conclusive evidence that the penalized player didn't intentionally target a defenseless player in order to overturn the call on the field.

NPR: New Rule To Add Ejection For Intentional High Hit

As for the high hits, chairman and Air Force coach Troy Calhoun said the committee wanted to address clear instances where a defender is leading with the crown of his head to hit a defenseless player above the shoulders.

NPR: New Rule To Add Ejection For Intentional High Hit