If Luke wasn't getting in to things after the whistle all the time they probably let it go at the end of the third, but there are times where you don't retaliate and live to fight another day. If Duluth would have scored on that power play that would have been Luke's fault and no one else. Refs were calling anything after the whistle so Luke should have known. Rhett got lucky he didn't get a penalty for what looked like a slew-foot before he drew a penalty in the slot.