You don't, but as soon as you see the car in front of you change the lane (or just indicating via turn signal), you should?
And to be honest, this looks more like slowing down and not a hard break, and at least the first following driver slept quite a bit... agreed the stopping had no reason, so (as someone quoted German laws) for that you would be too blame... but for crashing into the car with that video footage, I'm sure the following driver would get at least 80% if not 100% blame.
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