I should have stated in my first but forgot, I always shoot using 14-bit NEF RAW + JPEG. The JPEG is only a back-up and gets deleted after I transfer the NEF RAW to my hard drive.
I was using ISO 200 and not 100 to try and keep my shutter speeds as high as possible because there was a lot of erratic movement during the sword demonstration. Having to use f/5.6 (f/4+1-stop) to maintain lens sharpness plus no flash, and in the shade of the trees made it a challenge. Also, no time before the demonstration to do a test shot.