True heroes come from the heart and not by ability. To help others require guts and knowledge. More often than not, it is very little about your ability to fight, sometimes it is as simple as calling an ambulance or speaking up when needed to.

Bystander_effect is well documented. Following are a few videos that illustrate this behaviour:

The following news articles give you a glimpse of the dangers of “jumping in to help”:

Some considerations and recommendations on what you need to know:

Exercise
What kind of knowledge should you acquire to be able to help others?
How would you protect yourself while helping others?

Don’t just stand there!