hm I think nose at rear quarter panel means there's some overlap, but certainly not enough to declare the inside line is his (except in BTCC of course), you'll just have to cut him off first to protect yourself, it comes down to whether you think he cares about his SR of not, some people do that just to scare the car in front for him to moveover, but some really do think it's okay to pass with a bit of contact. if he doesn't care about his SR, don't give him any gap to dive down the inside at the first place, and if you cut him off first and hit the side of his front, he is more likely to spin than you.