Life isnt fair, eh?
But Infected is quite right.
Here on the Alienbreeder CC-Blocking isnt allowed, dosnt mater what map or what highranked player done it.
The only things what you can do is
a.) vote him and sell the blocking buildings
or
b.) report him
There isnt much what you can do against it when no admin is online..
except you go alien, and bite his ass out of the cc ^^ ahahaha