Since it sounds like they're surgical, Magnus doesn't even know if his healing will work on them. He thinks about pointing out that he did just tell her about keeping Amir's brain from breaking, but this is a no so he's gonna respect i---

Wait. Did he mention the thing about Amir's brain? Like, out loud? It's useful information. "Alex says I'm the one who stopped Amir's brain from breaking when he saw the Bifrost," he says, for clarification. "And I wouldn't force anything. But I take your point. It's not like I could, like, stab myself in the skull to test-drive this one."