I've found PNH's horsenalities to be very helpful: a horse has a main horsenality, then a sub-horsenality which emerges when it's scared.
Sounds like Paragon's left-brain mainly (won't rest till rules other horses), then goes extroverted (has to move his feet, rather than freezes-plus-explodes?) when scared.
Left-brain=calm & deliberate & thinking, right-brain=reacting/not thinking, then extrovert or introvert for each side with its attendant behaviours makes the 4 main horsenalities.
I have a Savvy Club dvd in which Pat works with the 4 types, showing how each requires a different approach. (On one of the four, imo he messed up with horse at start, so took longer to bring horse around, but he did).
So, this material might help you get clear on Paragon & able to give him the leadership (& language & love) that he needs. You might want to call the PNH office!
Also, there's Dr. Deb Bennett's "Birdie Book", which is all about the horse's attention/birdie, which, every time it flies out from him to some object out yonder, makes the horse reactive/not ok inside. I've not read it, but from reading a lot of her forum posts, I'm sure that it's a valuable book.