It turns out Lucius Malfoywassupposed to get knocked flat on his ass inHarry Potter and the Chamber of Secrets— andJason Isaacswas totally up for it. But at a packed FanExpo Denver panel moderated by Collider’sMaggie Lovitt, Isaacs revealed why one of the most beloved book moments — the fistfight between Lucius and Arthur Weasley — was ultimately left on the cutting room floor… or more accurately, never even filmed. “Yes, Idon’twish I could have done the fight,” Isaacs said, laughing. “It was a brilliant question. It’s the difference between reading a book and making a film.”

In the originalChamber of Secretsnovel, the two hot-headed wizard dads famously get into a physical brawl inside Flourish and Blotts. Wands? Optional. Flying fists? Mandatory. But when it came time to shoot the movie, directorChris Columbusmade the deliberate choice to hold back. Isaacs told fans:

Jason Isaacs at FanExpo Denver

“In the book, they have a fight. Arthur Weasley knocks Lucius on his arse — or ‘ass,’ as you would say. And the reason we didn’t do it, and I talked about it with Chris Columbus, is because in a movie, you want towaitfor the satisfaction of Lucius getting his comeuppance.”

That payoff, according to Isaacs, was reserved for the film’s climax — whenDobbyfamously socks it to Malfoy by setting Harry free and returning the favor with a literal sock.

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“We get that when Dobby knocks me over. If you’d got it at the beginning of the film, Lucius wouldn’t have any status.You wouldn’t build up the threat. You wouldn’t be scared of him.And then right at the end, when Dumbledore goes, ‘I know it was you. Don’t ever do it again,’ and I come out… then I get Dobby the sock. That’s where the audience finally gets satisfied."

Jason Isaacs Says Some ‘Harry Potter’ Scenes Need to Stay in Books

Isaacs even pointed to other book-to-film deviations, like how theDeathly Hallowsfinale condensed 50 pages about wand ownership into an explosive final duel. “That doesn’t work in the film,” he said. “It’s going to be a big old fight in the film.” Still, he acknowledged fans’ love for the missing moment — and his own enthusiasm for taking a hit. Just maybe not at the cost of Lucius’ carefully constructed menace.

Stay tuned to Collider for more updates from FanExpo Denver.

Harry Potter and the Chamber of Secrets

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Jason Isaacs