CUP: Kyle Busch, Harvick ? Handshake Or Not?

A week after Sonoma, some still wonder about the meaning behind the handshake shared between Kyle Busch and Kevin Harvick?

Source: http://nascar.speedtv.com/article/cup-kyle-busch-kevin-harvick-nascar-handshake-or-not/

Elio de Angelis Marco Apicella Mário de Araújo Cabral Frank Armi