Umm, yes, Jack, we know. He means will the reflected image, cast onto a screen, bear the shadow of the person.
What allows a mirror to cast a shadow in the dot situation is that the light has a specific point of origin, and there are specific spots on the mirror from which light cannot reflect; this guarantees certain areas on the screen where light cannot touch. What is different in the second situation, with the person, is that while the light still has a specific point of origin, it can reflect from anywhere on the mirror, so any light that manages to reach the mirror ‘behind’ the person will be reflected into the shadow, decreasing its definition. This would be impossible in an ideal situation in which all bodies except for the mirror are perfectly absorptive, and the experiment is held in a vacuum, but in reality even if we ignore ambient light the primary light will still be dispersed somewhat by the air in the room. So the shadow will be somewhat ill defined. Of course, if the light is larger than your body, then the size of the shadow will decrease until it disappears, again because there is no restriction on where on the mirror the light can reflect.