i think to kill you either there needs to be enough power to burn organs, which still may only affect one limb and not be fatal, or to pass through your heart,

i think to kill you either there needs to be enough power to burn organs, which still may only affect one limb and not be fatal, or to pass through your heart, say from one arm to another, or arm to opposite leg, and for your heart to be disrupted rather than just shocked. But the two aspects are the amount of power and the path the current takes. Maybe the floor tile was above a waterproof membrane, like a wet-room, and so inhibited the power current flow?