I've always been partial to the "Superman has a skin tight nigh invulnerable forcefield which is the source of his invulnerability."Grace is building up to coming out as alien dramatically isn't she? Poor squirrel.
meanwhile, in NP and it's discussion of superheroes, I've always said that an invulnerability power is mostly a personal inertial compensater. Reactive barriers work too of course but they lack a certain elegance.
Given how flustered they both are and that there's at least one alternate universe with Elliot and Tedd dating, I think he's ENTIRELY aware.Latest EGSNP: Shive's commentary suggests he merely added the bubbles to the background so it wouldn't be just a blank grey space. I wonder if he's aware what a bubbley background traditionally signifies in manga. (It's love.)