Vettel should not have braked at all, he had such a speed advantage he was storming by, it was Vettels rear wheel that caught webbers front, such was the overlap, and they wheren't even quite at the corner, basically, it was Vettels corner, he would arrive their first, all MW could have possibly done is tried to defend around the outside (same line Jenson took against Lewis), but if Vettel wanted to be aggressive, having his nose well and truly in front meant he could have closed the door by apexing early, running wide and squeezing webber off the track, which he would have been entitled to do..
Webber choose an action that although technically valid was IMO very poor indeed..
Technically correct, logically daft.. IMO..