The actor – now 35-years-old – said via LadBible: “I was told in no uncertain terms by Alan Rickman, ‘don’t step on my fucking cloak’. I sort of giggled, the Death Eaters and I looked at each other [like] ‘is he joking?’ It quickly became apparent that he was definitely not joking.

“The next take, the director was very keen for me to walk as close as I can to Alan, and we got about half way down the Great Hall before [mimes getting choked around the neck]. You have to bear in mind that his cloak was attached around his neck. [I] nearly killed the poor man. Then he turned around again and gave me a look that you never ever want to see.”

“Very luckily, the next take someone else stepped on his cloak, so that kind of took the heat away from me.

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The upcoming television reboot of the fantasy franchise was confirmed by HBO earlier this year, and will be the first-ever series based on the iconic books.