I knew there were no signals, I put myself wrong, I meant that the time distance between the events was small and the spatial distance was large, so that if there were signals they would have to be> c which is impossible.
Problem is that it is impossible to say which measurement was the cause of...
Alice measures the spin, also Bob measures.
If we assume that the signals (from Alice to Bob) were sent, they had to be with the speed e.g. 10 c
But in another frame of reference Bob first measures, next Alice.
Measurement of Alice was cause and was sent back in time, or measurement of Bob was...