I think you are looking at this the wrong way, if you don't mind me saying so.
Your insurer will tell you if - from the insurance perspective - there's any prospect of claiming off the Audi's policy.
But, this should not be your focus. As a driver, you have just been in a situation that could have ended-up very badly.
Look at the footage, and ask yourself - what could I have reasonably done to avoid this? (I say 'reasonably', because you could have avoided it in many ways including satying at home or taking the train, but this will obviously be missing the point).
My view is that you should have kept a proper distance from the car in front if you, and when the car acted in an unexpected way, you should slowed or stopped, giving it the space to do the next move.
This lesson can save you life, and the lives of others, in future, and to my mind is more important that who's policy will pay for the damage.