In this version of the video of bystanders confronting the walmart stabbing perpretator (which doesn't have sound censored), if you listen closely about 22 seconds in, the soft spoken voice says put your head(?) on the ground. You hear another voice say okay, I'm muslim, then the soft spoken voice says lay on the ground... Aparrently, it is frowned upon by allah, for muslims to lay on their stomach, thus the comment why gilles doesn't want to lay down on the ground, supporting the comment he is muslim.