Please allow 14.5 MB QuickTime movie to load. You can play it, but it's intended to be stepped through frame by frame. Once loaded, use arrow keys to step.

When you see a full frame flash, the shutter was switched OFF. When you see a flash over a couple of frames, the shutter was switched ON.

By the way, the QuickTime movie is in PhotoJPEG format, so hopefully as lossless as a lossy codec gets, without causing viewing problems for those without the XDCAM-EX codec in their system.