Trying to reverse engineer this from his previous posts, he was activate in a thread about how the camera app sometimes lags. So maybe that? This is when you open the iOS camera app and the screen doesn't update with what the camera is pointing at.
I've had that happen once or twice out of a few hundred times that I've used the iOS 10 camera app so far. One of the times was extremely frustrating though. The area I live in unexpectedly (to the point that most of the local TV meteorologists officially apologized for missing it) got the effects of hurricane Matthew. At my house (which is newer, so this was our first major storm) super-strong wind gusts would push outside water under french doors and into the house. I needed to get a video of this happening to show the builder. These wind gusts were random, and sometimes 15-20 minutes apart. Tried to take a video when it happened, and the camera opened up to a blurred screen and wouldn't refresh. Force-quiting the app and going back in didn't fix it. Fixed itself about 30 seconds later, but I missed what I needed to record.
Someone linked to a video of the lag in this post. Most of the video is how to create the lag, skip to the very end to see the actual effect.