Since this bug is somehow like Garry's mod style, I should called a bad bug. Also support griefers.
http://www.youtube.com/watch?v=dN3P8kDZMNg
Well, it makes ppl inside blocks, so that they cannot shoot everything, nor see everything. But ppl outside the blocks can see him, and pwn him with a nade easily.
The only way to help out of this bug is sucuide. Or get killed. If you stay too long, you get a error.
//Tested on Sham's server, got a votekick considered griefing =))