Look in my pic and see the guy in front of me using a "vertical" device "shooting correctly" when held horizontally and in full screen.
When you shoot this type of wide action video in vertical you get fast and wild swings trying to keep the action in the narrow center and it is very often cut off sides or interesting parts out of frame. Also vertical is VERY unnatural to the way we actually see.
Also Marques should have shot if for his YouTube channel instead of Instagram. This is a far too important video for the informal Instagram.