Looked at the crappy video again and saw no "hovering". From the appearance of the plume, the majority of the video was when the missile was a long distance away and exo-atmospheric or close to it. Relative motion would of course be small if fired to the west as it would heading to the Kwakalein test range like most military test shots..
See what you want to, I watched dozens of Vandenburg launches over the years and know what I see.