Яшин по мотивам бытовой мести решил убить

Yashin, based on domestic revenge, decided to kill Alalykin. He aimed at it from a loaded hunting rifle and fired. However, at that moment he stumbled, and the bullet hit Shabusov, who at that time went out onto the balcony.
What mistake is contained in the actions of Yashin and what is its significance for qualification?

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