I hate the word “rip-off”. What we generally call rip-offs are actually works we discovered their references from. But see, every movie has references. Copied, transformed and re-imagined images, actions and plots. There isn’t any movie that doesn’t rip-off. Dam Busters was based on a book which was in turn based on a real story from WW2. As with all George Lucas’ work, the scene is an a deliberate and acknowledged homage.