Anwar, i dont think so that the accident happened due to sudden braking. if you see the video once again you will notice that down elevator was applied immediately before the sudden drip. this is my observation..........................
Sandeep

He did say in the video that he saw the Cessna in front suddenly, and all he could do was to "slam the brakes".

i here saying this that he saw cessna while he was doing on seat belt. but do you agree what i said about down elevator thing.................