To bring this topic back to life, been thinking about what might be changed for the overall experience. Knowing how Towers can throw in little Easter eggs around the place, I have been thinking if Duel was to have little in jokes for the enthusiasts, I have just thought of something that would be a major Easter egg for the park's history but perhaps the most terrifying thing that many from a certain age will know who I'm talking about...
Yes, having that demon from Hell on the new version of Duel/HH would increase the scare factor far more than many of Merlin's 'scary' attractions in recent years.
The thought of that thing lying around in the Towers Boneyard awaiting to be reuse gives me the creeps. Give it some horror TLC theming and oh God the less said the better!