A movie with water footsteps from ghosts?
 

Hi
Years ago I saw a scene from a movie which scared me and I went on to another channel. I regret that now, since I have been thinking on this movie often after this.
Here is what I remember:
A lady is standig at the speekers platform in some sort of a courtroom. I think she wants to make peace with the water ghosts but as she speaks an invisible thing with footsteps of water comes up to her and kills her (a very bloody murder if i remember correctly). I think the courtroom was mostly empty (exept invisible creatures and the lady). I picture the lady as as Judi Dench but since I can't find the movie on her imdb i guess it's not her.
Hope I rang someones bell