I was playing on the wcs server, in cs_office where a terrorist was the race "Lego Man". He locked himself into the room where the projector and 2 hostages were. He didn't block the pathway fully in there, he let 1 tiny crouch spot open, so he didn't break any rule. He was standing on the other side with the m3 shoutgun shooting everyone trying to get in. We didn't manage to kill him, but if we luckly did, we wouldn't be able to complete the objective since the hostages were stuck inside.
It was getting pretty annoying playing and being unable to complete the objective of the map. So I guess there could be made some kind of rule agianst this??