So I was toying around with Armored to the teeth, I put my shield in my offhand, go AFK, come back with around 100+ more AP, I put my other two hand back in my offhand, and still have the extra AP for 27 seconds.
Not the best exploit, could be useful to do before an arena match. You can do this as long as if you have the talent Armored to the teeth
This works because the talent seems to be laggy when you switch to a shield, and back to a 2h, the more armor your shield has, the more AP you'll get, the extra AP also goes away if you switch stances.
Pics:
Edit: I searched "Armored to the teeth" in search and found nothing similar to this.