Would be interesting to see altitude&speed labels on that flight-track map. Looks like a roller coaster ride. If the vertical lines/green dots are data points taken at regular time intervals it appears that they were travelling at a fairly consistent speed over this last ~1 minute of flight (trying to account for the POV and direction of flight), except for a brief moment almost directly below the "N1" label. After which there is a sharp increase in speed and, to a lesser extent, descent. He was really skimming Rte 101 at the start of that final minute.