I have considered Greg Strong's input so I'm making a new rule (the one Greg proposed actually):
A player cannot move into a Brouhaha Square but may capture a piece already on it. Only the pieces initially placed there have special powers.
The second part is there to highlight that the special powers are given to help in the opening they don't go further to the possible capturer of the pieces initially placed on the brouhaha squares. Also remember that the special powers are just move abilities.
I have considered Greg Strong's input so I'm making a new rule (the one Greg proposed actually):
A player cannot move into a Brouhaha Square but may capture a piece already on it. Only the pieces initially placed there have special powers.
The second part is there to highlight that the special powers are given to help in the opening they don't go further to the possible capturer of the pieces initially placed on the brouhaha squares. Also remember that the special powers are just move abilities.