In beards, or his own beard, is a phrase that means on your own face, in front of. It refers to a way of challenging someone directly, demonstrating power. Before their eyes. Front, front.
on 40 beards; of those 41 Arabs; It is incorrectly written and it should be written as "blatant" being its meaning: Do something in front of others, without any hesitation. They are Arabs. Chinese. etc.
In the slums, on its face, in front of him - she. Another similar expression: in the Kissers (of those. . . )
In his presence = in their noses.