What's  wrong with you? Leave him alone! I caught them in the moment of almost being killed. Go away before I shoot you too! I acted as if I were going to call the police and he charged towards me. I shooed them to run away. I saved their lives,but who was going to save mines? Do something! Don't just stand there.

I Believe that it is important for a person to do something, because it can prevent you,or someone else from an event turning into a bad situation.
For example, you've been thinking about starting to get all A's,so you can go to your best friends party. You can think about the party and your grades all day,but if you don't show effort in making A's, then you won't be able to go to the party and your friend will be disappointed.
Doing something can also prevent someone else from going into a bad situation. For instance,say your friend was about to get in a fight because someone was talking lip. Her fist was extremely close to her face, but then you came and seen them. You ran over to your friend and held her fist down. Y'all heard keys jiggling, and suddenly rushed out the door. That saved someone else and you from getting in serious trouble.
In conclusion, you should always do something because you can save yourself or someone else out of a big problem.