Rosberg said : ' The No 1 rule for us as team - mates is that we must not collide -- but that is exactly what happened .
Rosberg leads Hamilton by 29 points at the top of the drivers ' world championship standings .
Rosberg , who leads Hamilton by 29 points at the top of the drivers ' world championship standings , said : ' The No 1 rule for us as team - mates is that we must not collide -- but that is exactly what happened .