So, it's right at the beginning where you're fighting the Ogre (the second time). First thing I did was have my Rogue Hawke use Poison Bomb on the Ogre to stun it. The Ogre, while I was doing my attack animation, started to go into his attack animation to charge me. When my attack hit, the Ogre got stunned but he proceeded to continue the attack animation and attack me while he was stunned.
Here's my photographic evidence:

You can see the blue text there that shows he is stunned. I
think those dots trailing behind him is also part of the stun effect.
This is a reproducable effect. This is one of the reasons why I bumped the difficulty down to normal because this kept happening making me die quite vigorously.
So what do you think? Is it a bug or is Hard Mode cheating? <_<