Sometimes when you gib a player/CPU, the explosion of blood appears to clip through an invisible layer or something, causing a line of blood to appear in the border of the animation. Here it is:
http://imgur.com/a/3Q8Cf
Ok, so I actually drew it on paint... Busted.

But believe me, it does happen, not very rarely too. I just couldn't get it on video because of bad FPS.
PS: Also, why is blood orange?