As a tall man who likes to walk at night, I have long understood that women alone at night do not wish to encounter me. So when I happen to find myself following a woman down the street, I will either slow down, cross the street, or stop and look at a sign or something for a minute to give her some space.
In a dangerous and shitty world, a person has to find subtle and quiet ways to express care, compassion, and solidarity. It costs me nothing to make a woman feel safer.