I understand why the parrying rules were made as they are, but to me, they seem inconsistent with the rest of the rules. it is one of the only places where you get a flat advantage out of a roll without calling raises.
Thus all attacks now have a TN to parry equal to 5+5*attack knack. this brings it in line with other things in the system.
The attacker can make raises to the attack roll to make the attack harder to parry, one raise on the attack forces one raise on the parry roll.