And when My servants ask you concerning Me, I am indeed close (to them): I respond to the du'a (prayer) of every suppliant when they call on Me - Quran 2:186)
Wallahu A'lam sis. You can see he's praying on the bare ground, with no mat. He's got a book infront of him ... I guess its diff to praying inside a masjid where you have to remove shoes, or even at home. Wallahu A'lam though.