"Yes. Magic often has strange results when things go wrong, but rarely this dramatic and this stable at the same time."

"The being summoned part is normal for me. Just not the destination or the wizards."

"Do you think it's reproducible here?"

"Worth finding a volunteer to check but in case something weird is going on I do want to look for a volunteer first."

"You can contact others of your kind from here? Have you told any of them about magic?"

"I can write them letters and they can make the letters when they check their mail. I haven't done this yet because the basilisk and also your fellow faculty member's unpleasant habits seemed like the priority."

"Witches and wizards have concealed our existence from all others for centuries, for our own safety. It would be unwise to disrupt that situation, even or perhaps especially with beings from another reality."

"...your safety from... people who do not have magic?"

"When the Statute was ratified, they outnumbered us three thousand to one. Now they have weapons that kill thousands in a moment, and outnumber us five thousand to one. Conflict between our peoples would be a catastrophe for everyone."

"Some people approach this sort of problem with, like, political philosophy."

"I'm not quite sure what you mean."

"It's not very high on the triage list, never mind."

"And here we are." She stops in front of a portrait of a large pink-clad woman, glances at Lockhart, and whispers something inaudible; the painting frame swings out to reveal a hole wide enough to climb through. Cam might need to pull his wings in all the way.

They fold up real small.

Inside are some people doing their homework, two boys playing cards, and the redheaded girl writing in a little black book in one corner. The boys look up at the two professors in surprise, and their deck of cards disintegrates violently.

Cam waves in a nonthreatening manner.

She notices him, blinks a couple times, notices Harry, squeaks quietly, and shoves the book in her bag.

...Cam attempts to conjure a copy of the book.

No sale.

"Book's magic. Or something else that foxes me but probably magic. I don't know how common that is."

"Miss Weasley, I need to speak to you for a moment. Please bring your book with you." She waves her wand and the wall acquires a door to a small office. The other children look torn between intense curiosity and "whatever trouble you're in, better you than me".

Cam will, uh, loiter awkwardly.

Just so long as he's loitering awkwardly inside the office where McGonagall can keep an eye on him. He and Lockhart can be Awkward Loitering Buddies.

"Miss Weasley, I'm going to need to take a look at that book of yours."

"It's my diary? Wh-why do you want to read my diary?" 

"I believe it may be enchanted in some way--perhaps cursed. If it proves to be merely an ordinary diary, I assure you I will return it intact."