Ok it definitely seems to be a teammates health bar upon joining another server and looking for myself. Why it is up near the roof I have no idea. I do think that was taken in warmup though, as that's the original allied spawn and I'm just standing there centerviewed. Ppl always mess around with nades and other explosives, getting blown all over the place, maybe just by chance it took a PB SS right as someone flew by my head. Also the PB SS are only like a 1/4 of my screen or less, made my own server and took some of myself, it only captured the center of my screen, chopping off large areas in all directions, so if it actually showed the whole screen, I bet you'd see a player model above me.
Here's one I took of myself:
That was with +stats menu brought down, and as you can see it only got the very bottom, even though I had about 10 different weapon stats, and only a very small area.
Oh and here's one of the health bar:
Look familiar???? Stupid newb admin said he contacted an admin here, who confirmed it was a hack. Probably bullshitting though.