ummm, i was slightly confused due to the mixup of dead spike and hell's fang.
Anyway most Ragnas think it's cute to Dash cancel after....5D i think? the move where he swings the sword up and down? it's a drive move.
Whenever he dash cancels after that spam 2a. completely safe, stops his pressure, and your liable to stat a combo. You might even be able to squeeze a 2c in there.
Start of the match if you think he's gonna do hell's fang mash C, it WILL stop him.
If you even so much as think he's gonna do Hell's Fang anywhere in the match and you have a safe distance between you and him. mash C it WILL stop him. You could even backdash and 2DD 214D
other than that Dead angle him. Your v-13 i'm pretty sure he fears you more than you think. so give him a reason to :\ Just watch out, good Ragnas like to bait the 214D after Hell's fang so if you try to punish him for the first part you might get a face full of bloody do do. :D
and remember kids knowing is half the battle.