User blog comment:MilitaryBrat/Lord Voldemort vs Darth Vader/@comment-181289-20111217025951/@comment-181289-20111217174853

Jwarrior: Unfortunately unless it's sourced on the wiki as in Rowling saying she in fact did it non verbally I won't take that as proof she did it non-verbally, given wiki's are written by the fans and they may be assuming that it was done non-verbally. As I said the scene at the time wasn't focused on the caster.