I don't get why some people are defending Mag because he moved once and not twice. The problem isn't the number of moves made, but the timing. The rules states that you cannot move after the car behind has made the move. Leclerc clearly moves to the right and almost a second laster Mag tries to defend. Even if he moves 5ms (again, we talk about more than half a second in this case) after Leclerc has made his, he is still at fault, cause Mag wanted to wait until the end to defend and that's a risk he was willing to run. That's a clear penalty, easy.
And again to those saying the stewards are right: we've seen multiple times that the stewards in F1 are not reliable, with penalties that differs based on the driver committing the infraction. So whatever is the decision chosen by the stewards, it's not necessarily the correct one.
While I won't put a disagree on your post just to flame, your claim of rules is interesting: point to where in recent published F1 sporting regulations, where it says that 'you cannot move after the car behind has made the move', and let me know when and where you found it.
Rights to rights, I agree that stewards are not always right, f.i. I think it was odd to hand Alonso a penalty after recognizing Strolls fault in forcing him off.
Yeah, that would be called blocking and it's not allowed.
Again, during what times is moving in front of another car called blocking and when is it defending?