Quote Originally Posted by Lt. Randazzo View Post
They moved with purpose and had a counter for everything. It didn't even seem like an indirect lightsaber strike did anything to their armor and that it took a direct impaling move to damage and/or kill them.
Quote Originally Posted by Dr Channard View Post
It struck me as odd that Kylo had just used a simple force trick to kill Snoke, but then immediately after he almost got choked-out by the guard. Wasn’t sure what the deal with those guards was and how they kept up with Kylo and Rey in a fight.
It's been brought up already, but the Star Wars: The Last Jedi - Visual Dictionary is worth the ~$15. Here's a quote:

"The layered armor of the Praetorian Guard is a high-tech onion-skin of laminate, impregnated with conductive wirepaths that, once powered, create an intense local magnetic field. Once this energy-intensive field activates, the powered plates can deflect blaster fire. Even a lightsaber will glance off, though a directed thrust will penetrate the shell."

The Praetorian Guard's fighting style is comprised of Teras Kasi, Bakuuni Hand, (unarmed) Enchani, and Nar Kanji. Without knowing anything specific about the other styles, I know that Teras Kasi was developed to counter/fight Jedi.