Farah took one step and did not gain any advantage.
Farah was obviously being crowded in his lane, and did it to prevent falling.
Had Farrah not made that one step he was certainly would have fallen.
Nor did Farrah gain an advantage in passing, because he was already in front.
However the other athlete was trying to gain an advantage in passing: he was cutting into lane one and trying to gain an advantage on the other athletes behind him.
Saying that Farrah was not contacted and therefore he should be disqualified is rubbish.
If the athlete next to him had been in front and cutting in, the other athlete would be disqualified. He was next to him and cutting in and it should have the same effect. The other athlete was impinging on Farrah, and because he was using an unfair tactic, Farrah should be allowed at least one step inside the rail. Also in that circumstance it should be legal for Farrah to push the other athlete AS HARD AS HE WANTS.
What the IAAF is doing and Coe is cowardly. It's similar to the article that was printed about Sir Rodger Bannister after his death. You know the article about the guy cleaning to run a sub 4 Mile before Bannister.
I'm going to tell you what this is called. There's a phrase for used in some cultures: CRAB BUCKET MENTALITY.
By their action they have actually elevated Farrah even further above themselves, or lowered themselves even more.
Farrah need only proceed forward with dignity.