The action star has plenty of stunts and fights in the fantasy adventure, which also stars Michael Caine and "Game of Thrones" actress Rose Leslie.
"I was doing fight choreography for over a month and it kind of all changes when you have a propane tank strapped to your back and a flaming sword," Diesel said at the films London premiere on Monday night.
"If youre off a couple of inches your whole wardrobe will go up in flames."
Caine portrays Dolan 36th in the movie, a mentor to Diesels lead character Kaulder.
"Im very experienced so it was simple and the part was lovely ... and it was short," Caine said.
"I didnt spend 10 weeks getting up at half past six in the morning, I only did two weeks on the picture."
"The Last Witch Hunter" hits cinemas worldwide starting from Wednesday.(*)
Editor: Heru Purwanto
Copyright © ANTARA 2015
