This clip was brought to my attention last night. The skiing-tracking shots were done with the movi and phantom miro. I have to say I really admire the talent of the follow skier, who's listed as Kirk Bereska. To my mind, the aspects of these shot that play so well are the close tracking combined with its velocity. I don't think I'd ever be willing or able to do something like this with my rig. Any other more experienced ops out there care to speculate on another way this could be accomplished?