Not a mariner, but I'll guess for fun. I'd expect rows to fall at different times due to differences in weight or whatever. The ship was likely rolling between

Not a mariner, but I'll guess for fun. I'd expect rows to fall at different times due to differences in weight or whatever. The ship was likely rolling between port and starboard. So I'd expect a roughly even split of which direction the container rows fall. Maybe they even fell strictly in sequence due to how they were secured to each other. There might even be a video of this happening, but probably not a real high-quality one in the weather conditions that caused this...