In the original film you have no idea where you are, where the prison is or what is going on when this scene takes place. I wanted to fix that. It is also way too rapidly cut for my taste, and we jump from explotion to Bellatrix walking outside without a pause between the two. Also fixed.
Also wanted to keep the strong continuity of the music, with Voldemort’s foreboding theme from GoF (the previous film) to better bridge the two films in their sound design.