This sample image business is a blight. Look at my notes, all over the place now.

Indeed. How do you rectify that?

Also, isn't Nagi saying "If you ever do something like this" rather than "How could you?" I realize it's not always optimal to go for the literal translation, but in this case those seem to have two fairly different meanings.

Ralen is correct. As for the note placement, the situation seems worse now than it was a few days ago, though I'm not sure why.

Yup, I missed the ら somehow.
I dug back this post because I needed an example of the note placement breaking, but it's been fixed in the meantime. Let's see if I can get the bug to pop up again...