That vid explains a lot! An intrepid reporterette from 660 News in Calgary, was able to score an
interview with Santa before he took off on his run. Comet is taking the night off to enjoy Christmas with his family and Russell is flying in his stead.
Your vid shows why Santa gave Comet the night off. Comet appears to sometimes be a rather cranky reindeer. He best chill out, or at Santa's next BBQ, he may be venison steaks. BTW, Santa is a Flames fan, mostly because of the colours!