"Oh?"

"I have something for it that I left in my room, if you want to test whether you can get past it. It works the same way as making things invisible or silent."

"Sure, why not. Up to you how much you want to mess around with magic experiments before letting me make you immortal."

"...Right, your magic fails in a different way than doing nothing. Even if you're only using it to try to look at me?"

"I'm not gonna push anything to the point of doing damage to nearby stuff while I'm in Milliways, that'd be rude. Mostly looking at things is safe, anyway. I did once smash so much knowledge into my head at once that a boulder felt like a good remedy for the headache, but I've learned better since."

"...How much do you have to learn at once to feel like that?"

"Well, I can't exactly tell you, because I blacked out when it happened and woke up later surrounded by broken rocks and had to piece it all together from what I could see and the bits I still remembered. I know I was trying to learn how to do healing right, because I'd seen enough people do healing wrong to know it was harder than it looked, and I did come away knowing a lot more about how bodies are put together than I did before, but I've never been sure just how much information I hit myself with to get into that state. My best guess is it was something like the shape inside and outside of every human body that had ever lived, but it might have only gotten as far as every human body alive at the time. And I don't know how much detail it went into, though I'm pretty sure it was a lot."

That's... a decision.

"I don't think knowledge magic where I'm from does that. - Anyway, I'm curious if you can get past my defenses that way."

This man has made so many decisions.

"Sure, I can try it," he says, and gazes thoughtfully into the middle distance.