Dual Blades

[Drunken Monkey]

Chamber-blocking is done hitting the attack button with the same attack direction as you'd have to block with and denieing the enemy's attack while attacking yourself. You cannot block ranged attacks that way and it's quite hard to actually do chambers-blocks.
First video on youtube to find when looking for chamber blocks: https://www.youtube.com/watch?v=Hh35FVWuqF8