frog, if you know that section of track, you'll know you'd never have expected him to do that, i just got caught out by thining the guy had a brain. imagine being on a long straight on a trackday, you wouldnt expect the car you're indicating to pass would anchor on!
unfortunately passing at the ring often has to be done a lot quicker than on a regular track, as you have to carry your speed and not slow down. waiting behind someone and hoping to power past them on a straight just won't work unless you've got huge horsepower. (especially considering there aint many straight bits... lol) it's often done on the inside of a left hander when the slower car is keeping wide to let people past, you'd never get that on a trackday!
it's hard to understand unless youve driven it really, as it sounds well dodgy when people say it, you just think they're driving like a c*nt
it's why you have to keep an eye on whats going on behind you and make sure you allow people plenty of room to pass you.