I was playing in a campaign game and had the following situation occur. Dwarf Priest had Toughness and 1 Armor Cards Enemy attacks with Shredding Strike. Toughness is used, Draw another Armor. Armor is rolled and destroyed. Character takes 6. Booooo! Attached is the picture of the battle log.
I guess that's one less bug you have to fix. Wasn't intuitive to me to think about Toughness as an armor card as it's on Dwarf Abilities.
I was going to enter this defect today, had it happen to me last night. I did a search first to make sure someone else hadn't found it already, looks like it has been. Not intuitive at all, might want to change some wording around if you decide to keep considering toughness as an armor.
I think the thing to keep in mind is the symbol lower right corner of the card. An armor indicates it being an armor card. A shield indicates it's something used to block (remind yourself to face the enemy)