Blaise made his acting debut in Louis Malle's 1974 film Lacombe, Lucien. Malle had been looking for a non-actor to play the titular character in Lacombe, Lucien and was convinced that Blaise, then working as a woodcutter, would bring great authenticity to the role.
Blaise entered the film industry with Louis Malle's 1974 movie Lacombe, Lucien. Malle had been looking for someone without acting experience to play the main role in Lacombe, Lucien and thought that Blaise, who was working as a woodcutter at the time, would bring an air of authenticity to the character.