I believe JAs story in regard to the "posing in the shower" situation. She said he had been working out and "looked great" for his trip to Cancun. She said she wanted to take pix of him in the shower. I can envision her convincing him of this, appealing to his vanity/ego. Thus, the pix of his back/waist, him with his arms folded in front of him (showing his arms), etc. The close up of his face, IMO, was the last one that was truly posed and intended, and I think she had him sit down and have the water hit his face b/c the water "looked cool" (that's what she told LE about it, anyway.)
I think something happened right at that point (after the face shot) and that's when the camera moved downward and captured his legs, sitting, in that last shot. The picture is not centered or framed in any way; I think it was a "mis-click" so to speak.
If you look at the whole series (where I think she is using the timer in some of the sequence, thus the 4-6 second increments IIRC), the pix seem focused a lot on his neck and back, and that creeps me out.
(Regarding the timer, when you put a camera like that on "continuous shoot", it will automatically take pictures in X second intervals, based on the X timing you set. To do that, you have to keep the "click button" pressed down. If you take a pic while it's set to continuous shoot but do not hold the click button down, it will just take a single shot.