Desecration of the Sabbath based on a dream

Hello Rabbi,
 
There was a recent article about a man who lived in the ghetto, and his late rabbi appeared to him in a dream on the night of Simchat Torah, and demanded that he flee the place. The man fled with his family while traveling on Shabbat. After what happened, he asked Rabbi Zilberstein if he had acted correctly by desecrating Shabbat based on a dream, and he was told that he had. The article only presented some of the considerations, and I did not see a structured halachic answer.
 
On the one hand, a dream should not have a true halachic nepkm, just as it is ruled that one should not fear money that is said in a dream to be tithe money. On the other hand, if a person has true mystical intuition, one can distinguish a danger that he senses with a mystical sense from a danger that is sensed with the sense of sight or hearing. And even in doubt, it is a doubt that is a fiqon that postpones Shabbat. On the other hand, I wonder what the rulings would be for that person if a disaster had not occurred. That is, is it legitimate to say that he “took a risk” and in this case did the right thing, but if he had made a mistake – he would have been considered a violator of Shabbat. Similar to what we learned in the last lessons in the series on fiqon in halachah.
 
What does the rabbi think?
 

הצדיק הגיע בחלום לתלמידו בליל שמחת תורה והזהירו שיברח מהעוטף