While patrolling city streets

While patrolling the city streets, police lieutenant Sidorov and police ensign Artemov were offended by a group of young people standing near a playground. The insult was expressed in foul language addressed to patrolmen. Police lieutenant Sidorov demanded that a group of young people stop using obscene language, to which the latter began to shout obscene expressions even more often, while someone from the group of young people (during the investigation was not identified) launched a stone that hit the lieutenant’s head, causing him severe bodily harm. Police ensign Artyomov in response opened fire on defeat, while injuring citizen Sidorenko. Evaluate the current situation. Are the actions of a police officer lawful? List the use of weapons by police officers.