blocking is one thing but not turning around and tagging your cade buddy is a matter of professional courtesy as far as I am concerned. If I am in that situation and I get tagged, I ztele out and let my buddy duke it out. If i catch anyone blocking in tubes for their friends after they get tagged then they get a kick.

how detailed do you want to get with the rules?

Admins should be in game and monitoring this type of behavior and fixing it quickly.