IDK what Ragna you were playing who does Inferno Divider on wakeup (or out of the blue just random with them) without 50% to RC, that's extremely risky and kinda dumb. Ragna has a lot more tools for neutral game than just relying on Inferno Divider. He's got 5C, 6A which is upper body invincible within the first few frames, plus his 5B is Air-unblockable. In the corner,when he does his BE combos he should be finishing it with 3C > 22C or 3C > Hells Fang + Tsuika for corner oki. As I've seen in many matches, Platinum is pretty vulnerable to Ragna's pressure especially in the corner (JUMP AWAY FROM DEAD SPIKE PRESSURE, 5B > Dead Spike is not a viable frame trap anymore!). The only things that can save you are: if Ragna uses an overhead (6B,214B,2147B[without RCING it on block]) just 2A it and get a free CH Mami Circular combo out of the corner, if you have 50% you can CDT or Counter Assault out, or if you're fortunate, Homerun-desu~ should save you also. Oh yeah, interesting fact, Plat's 2B lowers her hitboxes low enough so that Ragna's j.C whiffs if he IADs and does it. I don't know if it works with Gauntlet Hades but It'd be worth a shot to experiment with.