If you are in a crowd when someone is suddenly injured, the best action is to:

In a situation where someone suddenly gets injured in a crowd, being confident and proactive in offering help is crucial. Assessing the scene and taking immediate action can significantly influence the victim's outcome. When you step forward, it can also encourage others to participate in the response, creating a more effective team effort in managing the emergency.

Taking initiative and not hesitating to help can make a vital difference in providing timely assistance. It is essential to approach the situation with a calm demeanor, letting others know that help is available and that you are willing to take charge or coordinate the response. This proactive attitude can reduce panic within the crowd and signal to others that action is needed.

On the other hand, waiting for someone else to step forward can delay critical help for the injured person, while solely offering a cellphone does not address the immediate need for physical assistance. Additionally, remaining nearby without engaging can lead to missed opportunities to provide aid that could potentially save a life. Hence, stepping up with confidence is the best course of action.