Broken Headshot Code?

[jamz]

It's good that people take the time to watch the demo before commenting. For the lazy-bones, here's some screenies:

I'm not a sniper rifle user, but it looks like a stick-on HS to me. In the last image you can see that there's no blood at all. Sonic has 20 HP before and after the shot, but the shot clearly hits, as the trail doesn't continue past his head.
My first thought was that the anti-cheat code resulted in the shot being ignored, but I believe this server doesn't use it; I could be wrong.