Final answer:
The most immediate and responsible action when facing a violent crowd incited by a protest leader is to call for help to ensure one's safety and effectively manage the situation. Documenting the incident also provides valuable records for future legal proceedings.
Step-by-step explanation:
When monitoring a large crowd of angry protestors at a political demonstration, if a protest leader is inciting the crowd to violence, the most immediate and responsible first action would be to call for help. Calling for reinforcements ensures that you have the necessary support to manage the situation safely and effectively.
Furthermore, it's essential to prioritize the safety of all individuals involved, including the protestors, the authorities, and the people within the building being protected. After ensuring help is on the way, documenting the incident, including taking note of the leader with the loudspeaker, provides a record for future legal proceedings.
If safe to do so, nonaggressive attempts can be made to de-escalate the situation. These actions align with principles of law enforcement and crowd control, emphasizing the importance of a measured response to potential violence.