Thanks xwordfan.
Tried googling Rubik. Got first name but not much else.
Also tried to find Bard's word for murderous. I am sure there is a site where they list all.
There are two 4 letter buffaloes.
I am presuming one of the may fit.
It could be ?RN?.
That means my 30d is wrong.
I am assuming it is a fencing term?