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.
Van Hoorick's actions took place during a time of great turmoil, as he joined the resistance movement against the Nazi occupation. In January 1943, he was apprehended by the Nazis and held captive in two of their notorious camps: Breendonk and Buchenwald.