PV Student and I have had a look at that diagram. The indicated pole bend at take off is greater than the maximum bend at any point in Bubka's vaults and we have calculated -crudely I must admit - that to get into that position a vaulter would have to be between 80 cms and 1 metre 'under' when the pole tip hit the back of the box.
In addition of course the extended right shin/thigh will tend to pull the athlete's hips forward at take off, prevent any chance of a strong body at and lead to early rotation. The problems naturally escalate from there.





