on damage of entity:
    attacker is player
    if projectile is a snowball or arrow:
        set damage to damage * (distance between attacker and victim*0.025+1)
        if y-coordinate of projectile - y-coordinate of victim is bigger than 1.5:
            set damage to damage * 2
            play sound "ENTITY_PLAYER_ATTACK_CRIT" to attacker with volume 2 and pitch 2
            message '&aヘッドショット！'