https://youtu.be/532M4UzfwKc?t=59s

^ you can kind of watch there to see where the person is standing when the Ravage Rider does that, they're standing pretty much in the middle. when it does crash, i would recommend you use dragon time after you walk up to it (not before, or else you'll have less time). also, when its health gets pretty low, i would definitely recommend you leave a little bit when its first health bar is still up. because for the 2nd one, the battle gets a lot tougher. so if you leave a bit of health in the 1st one, the next time it crashes you can just quick get rid of that, then get rid of a whole bunch of its 2nd health bar at once. it's still pretty challenging but this should make it easier.