Use the Cenarion Antidote on a Hulking Helboar and observe the results. Once you have the results of the experiment, return to Thiah Redmane at the Cenarion Post in Hellfire Peninsula.
I think there's something we can use in the blood as the base of an antidote. Don't look at me like I've lost my mind!
It's a common theme in nature. Often, the cure for something can be derived from the toxin itself. That's just what I aim to do.
Ridding the boars of their demonic influence would probably eliminate their aggression and give us insight into how to best attempt to help other species.