[MA] Aggressive Disarming & mixed skills

[jacobmuller]

Situation is: a player character has encountered a hit-team at his home. He's already killed two with a firearm but has been disarmed by his remaining opponent who is armed with a sword.
When the assassin next attacks, and the player responds with Aggressive Parry (Brawling), can he use Disarming as opposed to trying to punch through a sword?

MA p.65: "Success means you parry and may roll against the underlying skill to strike the attacking body part or weapon".

Is he restricted to his Brawling skill for the attack segment of the move, ie if he is allowed to strike to Disarm instead of Damage, is it based off his Brawling Skill or the Aggressive Parry (Brawling) Technique or can he use his Disarm (Brawling) technique?
For that matter, if he can use the Disarm Technique, does it have to be based off Brawling, eg if he has Disarm (Sumo) at a higher level?