Interesting theory over on the State Vs. Jodi Arias Facebook page...several of the folks commenting don't believe Travis knew she was taking pictures of him in the shower initially. And the pictures don't look posed to show his new physique to me. They just look like shots taken of someone in the shower. I am seriously wondering now if he did in fact think JA had left, he went to shower, and she sneaked back in the house after retrieving her weapons from the car.
Perhaps there is some truth to the point at which she dropped the camera. Maybe he saw the knife at this point and caused her to drop the camera when he lunged at her in his own self defense. Maybe he didn't intentionally "body slam" her, but instead knocked her down, again trying to protect himself. We know in JA's mind, she describes everything as she wants it to be.
At any rate, it's just a miracle some of the most damning evidence even exists...and makes one wonder what force was in effect to help Travis speak after he was gone...for example, the camera kept snapping pics even after being knocked to the floor and the memory card was intact even after going through the wash cycle.