Having looked at it a bit more, it looks like the OP pulls in behind the Audi, but doesn't realise there is a slip lane there. OP thinks he's on the inside lane, and gets caught out by the Audi slowing for the off-ramp. OP then angrily flashes his lights, overtakes close and fast on the right, and cuts back in to put himself in front of the Audi on the inside lane. OP is not looking where he is going, and then realises he is actually now on the slip road, and cuts back across to get back to the motorway, only there isn't room, and he hits the cones and the end of the barrier.
Looks like OP was so determined to cut up the Audi, he ended up on the slip road, tried to get back on the motorway, and failed spectacularly.
Looks like OP was so determined to cut up the Audi, he ended up on the slip road, tried to get back on the motorway, and failed spectacularly.