I saw a message in the castle at one point indicating a false wall and went nuts attacking everything for ten minutes, to no avail. Found out about pressing X much later!
Got an hour on it this evening and spent the whole time committing genocide on some very unpleasant characters in Huntsmans Copse. Drangleic is a safer place now
I like that you can wipe guys completely out in a level, it's cathartic. Have only done it here and in no mans wharf, I am not a maniac.