Bypass

It didn't take Rui more than a few moments to deduce the impact of the Martial Heart on a poison Martial Artist's power. It most likely empowered their ability to survive their own poisons and deploy greater concentrations and amounts of it, it also most likely empowered their ability to handle higher degrees of potency and toxicity. It allowed them to deploy these poisons against their opponents with greater ease.

Rui could see firsthand how effective the Martial Heart was in this regard.

It hadn't even been a minute, and the poison user had already wounded Senior Xanarn without any help from her comrades.

('She was caught off-guard.') Rui gritted his teeth. ('Not just that, but her defense isn't as effective against poison.')

The reason for that was simple. It had to do with the mechanics of airborne poisons.

They were basically gases. 

Senior Xanarn's sound was certainly tremendously powerful, however, her sound traveled through gases.