the mental disintegration of nico rosberg as a racing driver .
blaming the brit for slowing down and bunching him up as the ferrari of sebastian vettel celebrate on the podium in china .
the german driver blamed hamilton for slowing down and bunching him up as sebastian vettel closed in .
rosberg 's attitude seems to have changed in the aftermath of spa last august .
when on form , hamilton is an extraordinary racer , maybe utterly unbeatable that