Factual error: In the scene where the cast find the guns in the tiny coffins, they mention that it is not possible to tell if they are loaded because the clips are welded. Being semi-automatic pistols, simply pulling back the slide & ejecting the first round would have easily determined whether live or blank rounds had been loaded.

House on Haunted Hill (1999)
Plot summary
Directed by: William Malone
Starring: Famke Janssen, Geoffrey Rush, Taye Diggs, Peter Gallagher
Six guests are invited to Evelyn Stockard Price's birthday...Steven Price, Jennifer Janzen, Eddie Baker, Donald Blackburn, Melissa Marr, and Evelyn herself. The only problem? Those weren't the people on Price's list. When the six guests are trapped in the house with Watson Pritchett, the man Price rented the house from, the spirits within the house want revenge for something that happened long ago.
Evelyn: You know if you really love me, you'll find a way to drop dead in the next three seconds.
Stephen Price: Finding ways for me to die is really your deal, isn't it Eveline? Let's not forget the OJ knife with the not-quite-retractable blade. Your Jim Jones Kool-Aid was exactly that.
Evelyn: Accidents, all accidents until proven otherwise.
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Answer: Its just an illusion by Price. His rides are meant to confuse you. Like the tower ride looked like the cable broke and was falling to the ground.