It's probably a quick 'infinity' or 6' adjustment to focusing followed by taking the shot, much faster than having to AF first. A few of my compacts have that infinity thing, which is designed primarily for taking landscapes through windows where the camera's AF would normally focus on the window, but it's normally called 'infinity' or has a picture of a mountain or something similar. I'd suggest that the SNAP is the other option, i.e. that it quickly focuses at some fixed distance that will get a person or small group of people in focus and closes down the aperture as much as it's able to get good focus.