Good Example! President Jonathan Kneels To Salute Late Yar'Adua's Mother In Katsina

In as much I know he is President but the same time nothing stopped him from just greeting with his mouth but rather he went further to knelt down while greeting late Yar'Adua's mother during his visit in Katsina State today.
 Isn't that showing good example for others to emulate?..How many past Presidents have you ever seen doing this?. Humility is the key word!. See another photo below....