Faf Du Plessis escapes sanction over on-field collision with Jos Buttler

• Coming together during fourth Test deemed to be accidental
• But Stuart Broad punished for swearing during same incidentFaf Du Plessis has escaped sanction from the International Cricket Council for his on-field collision with England’s Jos Buttler on the final day of the fourth Test – but Stuart Broad has been punished for swearing at the South Africa captain during the same incident.Du Plessis and Buttler clashed at the end of the 57th over of a day that saw England sea