Image 3 of 5: You can just barely make out a figure on the tip of the Half Dome ledge called the "Diving Board"...

Image 4 of 5: This is an enlargement of the same frame showing the person standing on the diving board. This is Maryellen having another hiker take her photo with her camera.

Image 5 of 5: an 800% enlargement of Maryellen standing on the Diving Board having her picture taken.