User blog comment:Freedfg/Is vayne TOO versatile?/@comment-6334772-20130720013029/@comment-6334772-20130720023723

If someone sees Vayne disappear, they can aim a skillshot in that direction too. Twitch's stealth may take longer, but it lasts longer and resets aggro throughout the whole duration. I'd say Twitch disappears from a fight better than Vayne.