The love for the woman isn't strong enough to move them to act otherwise even the most introverted and cautious person will ignore all consequences and rush to save the woman and probably apprehend the man, and then later wonder how he/she was able to achieve the feat. That is what the force of love can do to people "subconsciously", unfortunately it's diminishing really quick in this world, especially amongst city dwellers who depend too much on governments for all everything and programmed by the media to hate or be suspicious of neighbors. They will be expecting the police to intervene, scared of what will happen if they personally intervene,. These worries and expectations are stronger than the love for the woman