Is it just me or does everyone overlook the fact the todd did say in the podcast that blocking was done by pulling both triggers? Was this changed since then or did he not say what he meant to say??
Then in a interview with OXM UK he said (paraphrasing) you block with a shield by pressing the respective hand button. So, if it's in your left hand you press left trigger.
As far as I know there is no straight form the Todd's mouth that we cannot block while using just a one handed weapon. And if that is the case, just unequip the spell to block.
http://www.youtube.com/watch?v=S6Xn0GbweAE