He left for Vietnam in 1967, completely abandoning the novel and wrote 'L'Homme aux sandales de caoutchouc', a controversial play celebrating Ho Chi Minh that was published, performed and translated into Arabic in 1970.
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L'Homme aux sandales de caoutchouc, hommages au Vietnam et à Ho Chi Minh, théâtre, Paris, Editions du Seuil, 1970, 288 pages.
Its name honors Nicolás Suárez Callaú (1861-1940) who owned major parts of today's Pando and Beni Departments in the times of the caoutchouc-boom.