Combe isn't hard, people pay no attention to the fact they are coming out of the pit lane with cold brakes and tyres, you pile on the speed from there until the slight left handed turn before quarry, which actually is quite a lift when you hit it, this causes people to brake, the ass end goes very light and then you're suddenly faced with quarry, too late, your rear is light, you're already turning left from the slight lift in the track and you bail into the barrier.
The other situation is as you leave quarry people get on it hard too fast and end up tank slapping on the straight and clout the barrier on the way out.
The best thing to remember at combe is turn ******* right when you're in trouble as the centre is a giant field!!