[Nero nods. It's not necessarily meant to be a compliment, he doesn't think, but he does appreciate Vergil's insight on his... learning process. (Some part of him is too ready to imagine him scorning Nero for being weak or incomplete, fumbling pathetically to utilize his power. At this point, he suspects that's more of him projecting than it is any judgment or view of Vergil.)]

It was broken. The Order had it in pieces in their lab, and their asshole chief alchemist was fucking around with it. When I went down there, his demons attacked me and... [He pauses a moment before he goes on.] I think I might have died? Or I at least came close.

Then Yamato saved me. Or my real power woke up. Maybe both? But the sword fixed itself and that's when I was able to use it.