Oh, hey! I actually got the "chain he used to restrained with" part into a comic! GOLD STARS FOR EVERYONE.
I like the detail of Grace pantomiming. I also like to the word "pantomiming", which I originally wrote as "pantoMINING". I guess that would be mining in an overly extravagant fashion? Is that was Minecraft is?
Anyway, yes, transformed Grace is really resistant to fire. Were Grace ever to make zombie survival plans (surely a thing she would never do), I hope she keeps in mind the possibilities of arming herself with a flamethrower.
Of course, fire isn't always a good idea against the undead, but we go by Final Fantasy IV rules 'round these parts, and it was great against them in that game, so nyeah.