The given scenario is known as the bystander effect because of his inactive role in an emergency situation.
This refers to the situation where a person keenly observes a situation from a distance without getting involved.
Hence, we can see that based on this concept of a bystander, the concept of a person who observes an emergency helps less when other people are present than when the observer is alone and this is known as the bystander effect.
Read more about bystander effect here:
https://brainly.com/question/3520355