if (destroyable == 1)
{
    if (other.big == 0)
    {
        hp--;
        speed = 3;
    }
    else
    {
        hp -= 3;
        speed = 0;
    }
    if (hp <= 0)
    {
        event_user(0);
        snd_play(snd_badexplosion);
        speed = 0;
    }
    else
    {
        timer = -1;
        snd_play(snd_damage);
    }
}
with (other)
    event_user(0);