Help Files

General Command
Syntax: BLOCK (direction)
To stop blocking an exit, type BLOCK without an argument.

Enables you to 'block' an exit, preventing people from travelling in that
direction. Useful for hunters, and others who want to 'corner' a target.
  
You CANNOT leave the room while blocking, as it terminates your block.
Other actions are still doable though, such as equipping and such. 
  
Blocking only works to block people IN the room, People can still use the
return exit from the other way to enter. You could ENTER a room, then be
unable to leave because someone is blocking the way you just came from.