Think of it this way.
If you want to slipstream, stay behind the guy infront.
If you want to pass, obviously go around the guy infront.
So anyone tell me, was Petrov behind Lewis and following OR was he trying to pass him on the straight.
If Petrov was trying to get through on the straight, do you really think he is going to follow a driver weaving back and forth? Had Petrov stayed straight after the 1st or 2nd weave he would have been side to side and had the next turn.
He tried to slipstream, Lewis tried to break that, not block off Petrov. Some people make these drivers seem retarded. They both knew what was going on.