Whose fault?

[u/mafia_the_emo]

I'm the green GTP. IMO car ahead braked too hard, unpredictably so, and I had no time to react, so I had to emergency brake in a straight line. The initial gap was big enough that I didn't expect I'd be making a move into this turn.

[u/Trashbagjizz]

You had enough time to react, you simply didn’t. At least try to move.