If the person is someone who is special to me then I will. They are worth saving and sacrificing for because I love them.
If the person is stranger yet he/she is a good human being then I will. Love your neighbor as much as you love yourself. I will be willing to help the stranger because I am also a human being just like him/her.
If the person is a stranger and is a bad person then I won't help him/her. That danger he/she is facing is his/her punishment for doing bad things.
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Yes, my willingness to help somebody gives me courage, aand makes me brave/happy, no matter what the risks is.