Maybe. I asked Steel-san about it before Vax and Percy fought, since I'd heard that it was a possibility, she said... [Well. She said a lot of things that he thinks a non-sword/non-sword adjacent might not understand, so he rephrases.] She didn't seem to think it was impossible, but--that it would have to be a true battle, and that surviving wouldn't come without a high cost.

[Which, in fairness to her, Vax and Percy did have to get pretty dang close to death before they got saved, so it's not like she was wrong.]

But I guess there's no reason it couldn't happen again, right?