Does the 7D Refocus Every Frame in an 8fps Burst?

Severian The Lame wrote:

No! That's the whole point of the back button focus technique. The point is that when you have the camera focused (or prefocused in the OP's case) where you want it, you simply take your shot(s) ​after you take your thumb off the AF-On or * button​. The AF system only has control over shutter release and refocusing while you have your thumb on the button.