A group of drunken hooligans began to beat glass with iron bars in the wagons of a commuter train arriving at the station. Passengers could not stop the hooligans. A senior police sergeant M. came to the rescue, he made an attempt to detain one of the violators, but the entire drunk company, six people, attacked the policeman and began to beat him. Defending himself, the sergeant fired a warning shot. However, this did not work. And then aimed shots sounded. One of the attackers was killed, the second was wounded, the rest fled.
Give a criminal assessment of M.'s actions.

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