Blocking has the same four positions of attacking. You have to have reflexes fast enough to adjust your blocking position to effectively avoid that attack. Basically, it works by having four kinds of attacks left, right, up, and forwards. If you've played Mount & Blade, you'll know that a large part of the game's formula relies on the combat, and the way blocking works. I normally don't request anything, I prefer trying to improvise and do it myself, but this one is way out of my league.