Swordsman Archive

I picked up some skill tapes that gave bonuses to counterattack and 2 handed melee counter attack. At first, I thought they were the same but after putting them on their appropriate sockets, the counterattack tapes stacked with my previous counter attack rating and the 2 handed melee counterattack created its own category. As it stands my counterattack reads 140/145 and I have a new category that reads 2 handed melee counter 0/5. What does that mean? I am worried that you are only allowed one defense and as such would hate it if the computer uses my 2 handed melee counter instead of my regular counter. Please advise....