In the video they show the full animation with the surrounding wave context and it makes it a little easier to understand than the gif. The first massive wave

In the video they show the full animation with the surrounding wave context and it makes it a little easier to understand than the gif. The first massive wave lumbers through at the same pace of the surrounding waves leaving you thinking "Oh that big wave is the rogue wave" when suddenly the bottom drops out and an even more massive wave comes very fast and seemingly overtakes the slower one. It seems like the slower large wave just stops in place and reduces in amplitude while the rogue wave overtakes it.