If you subtract your armor from the damage of this trap and get a negative result does this mean you take no wounds from the trap? So in other words, the trap does less damage that you have armor. I am pretty sure that means you would take no damage at all.

Ummm.... I don't have the card in front of me...

BUT - if say I roll a 7 for the damage of the swinging blade - and If I have 8 armor... (keep in mind I don't have the writing on the card) and the card says to subtract armor from the damage and that is the damage you take... In this instance -1 would be the result, then yes - your armor has blocked all the damage and you take no wounds.

Would be helpful to see the wording on the card to help for sure.