I ran across this video showing the initial experience with a 10 meter dive.  One doesn’t really have to wonder what the individuals are thinking as they are rather verbal and microphones were installed on the sides of the platform.  I don’t know how I would react, but probably I would start with the low dive and jump of each higher one in succession.  I did that same idea off a ladder leaned next to the house when I was many moons younger than now.  I actually stopped at the rung below the roof line as the impact was starting to hurt.  Just another example of how pain is an excellent instructor.  I haven’t jumped off a roof-line or ladder since.