The figure on the right looks incredibly like Debussy. He lived on the Bois de Boulogne at this time and would go for walks along it. His clothing and pose are *very* close to Debussy at this time. It would be amazing if this were really him, caught by accident on camera...In 1914, he was in Paris from January to February and then he travelled, returning in August. (http://www.debussy.fr/encd/bio/bio6_10-14.php)http://fc02.deviantart.net/fs70/f/2014/335/5/5/xfghxg_by_jack_o_tales-d88bf7b.jpg
Many thanks for this very interesting information. And you're right, his clothing and pose are very close to Debussy !