During the second world war Van Hoorick became a member of the resistance. He was apprehended by the Nazis in January 1943 and imprisoned in the Nazi concentration camps of Breendonk and Buchenwald.
During World War II, Van Hoorick participated in the fight against the occupying forces. He was detained by the Nazis in January 1943 and imprisoned in two of their infamous detention centers: Breendonk and Buchenwald.