both options are equally vaild depending on who is the attacker/defender
Cinematically speaking you see both cases often in movies and books
thematically speaking, in a true life or death fight, most people would parry, and think it was thier awesome parry that caused such a horrible miss
logically RQ6 encourages the parry since if you successfully parry a missed attack you get 1 special effect, and depending on your success, may get 2 effects
which include compless surrender, disarm opponent, injury damage weapon, entangle, and many other possible effects
Being defensive does not mean losing all offensive capability