Research and Planning - The importance of a sound, Harry Potter

Also today I watched probably in my opinion one of the greatest films ever made for the fact every last detail has been watched for and in this quintessential moment I noticed something also very interesting, the sound which builds up to when Voldermort kills Harry is almost as important as when it cuts out and I realised I could use this same technique in my movie trailer, as the sound increases it adds a tension and an on edge feeling but as soon as it stops I noticed a lot of people are so connected with the films and the character they actually breath in, I believe this to be a very powerful tool to have such a connection with the character and I wish to try and use this technique in my movie trailer or a similar technique just to see if you can give the same connection with a character during a trailer because I believe connection with your audience is how you draw them to the cinema.