I suspect a lot of people will disagree with me here... but I have no problem with that kind of driving. He pushed him to the edge of the track and no further. As long as the defending driver doesn't slowly drift towards the pit wall and close the gap then I don't mind it because it's still the edge of the track. I don't see why you should be able to push a driver to the edge of the track where there is run-off area on the outside but then not be able to do it on the main straight, it's just inconsistent.