found this helpful explanation of the random behavior which works well.
but I need to get to leave the lines without moving but stay at the start position, but this should work.
gonna try out with expression writing though I have not much experience with it.
It was a holiday recently for many parts of the world. In case you are wondering why there hasn't been a response to you.
To answer your question, there are several ways to get what you describe (I can't see your example due to restrictions on the network where I work). I would think a particle system would be good. Large emitter (or a swiftly, randomly moving emitter) with no velocity to the particles and an image of a line as a custom particle should do the trick. There are several particle systems that come free with AE.
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