Each to his own but I think that is border lien. I was maxed out on my 7D. Night game, F4 lens and at 12,800 I could only get to 1/500. Hands and feet have motion blur. I wish I could have prevented this with a higher speed. You can create prop blur on a plane at 1/320.
This is where technology comes in to help. A lens that goes f/2.8 lowers your ISO automatically from 12,800 to 6400. And if you have yet a camera that handles super high ISO's, 6400 is easy and now you have a very clean photo. You could then raise shutter back up to 1/800 and shoot at ISO 10,000 and still have very acceptable files. This is an extreme example, however. Looking at your file, though, I think you did very well.
I did not have a 2.8 lens telephoto at the time or I would have used it. Used my 300 F4 IS. The term fast lens really hit home that night. I just picked up the new 70-200 2.8