User blog comment:MilitaryBrat/Lord Voldemort vs Darth Vader/@comment-181289-20111217025951/@comment-4248317-20111219041419

@Swg66

Well, given the fact that she has read every book and seen every movie (as have I), I think that counts for something.

Also, you need to rewatch the movies, because Voldemort uses Avada Kadavra nonverbally numerous times

For example, this scene; you can clearly see his lips don't form the words as he casts the spell: http://www.youtube.com/watch?v=wkhZ-aJ5luY&feature=related

Again, Avada Kadavra CAN be cast nonverbally, but it is very difficult to do so. Voldemort was the most powerful dark wizard of his time, so its not hard to see him doing it.