Yeah, that's fair. I have changed into something. Something that can be kinda scary, depending on who you are. You're my pal though, my pet, and I don't want this thing that I've become, it's called a 'master mev', to come between us. I still love you. I'll still feed you, and my house is still your home. I'll take care of you like I've been doing. I hope you can get used to this new me. I'm warming up to it now that my friends have a plan to help me.

(Context: This dialogue is preceded by the the words, "She nodded though pained." Being a master mev means Rainbow Dash is different at night in subtle ways, such as having an innate preference to wear her vampire fangs and being more hungry for magic. She know that she is and feels different at night so is setting aside some time with Tank to reveal this fact. She shows him she can flash her eyes to red at will too though she doesn't go as far as showing she can change her wings to bat wings. Tank is initially scared when he does, in fact, sense the difference upon touching her. Rainbow Dash gives him this speech to ease his feelings, which does work.)

Whoa, all of you, you need to stop with the whole 'wrong' thing, okay? Just chill. Something is different, but it's not wrong. Twilight knows what's going on, and so do I. She's fine, alright. Some stuff happened this weekend, and we're working on it, but everything's fine. It's also kinda personal and between friends. Got it?

(Context: Ocellus has noticed Twilight Sparkle is not using magic and asking if Rainbow Dash knows anything about it. Rainbow does since she was the one who ate Twilight's magic as her first meal. Twilight's magic is temporarily gone and will return later. The act was done with Twilight's full knowledge and permission, which is an important thing for master mevs to do during the day. When Ocellus gets excited that Rainbow Dash knows what's "wrong", without being informed of all of the above yet, Rainbow grows defensive since her transformation is still so new to  her, and she's doing everything she's supposed to be doing to handle for it.

The dialogue for this line is preceded with the following:

They all looked at each other, then Gallus. The young griffon finally added, "We were just worried that something in general is wrong. I mean, is there a reason she's not using magic? She didn't lose it, did she?"

Rainbow tapped a hoof to her chin. "How can I explain this?"

"So you do know what's wrong!" said an eager Ocellus.)

It just seems important enough to have been noted in the book we have. The closest it comes to mentioning changelings is that I'll have to do business with other magical creatures. Then again, that book is super old. I'm not sure we're a commonly known thing. None of us ever heard of mevs before.

(Context: Rainbow Dash, Starlight Glimmer, and Fluttershy* are talking about Ocellus not being able to take on Rainbow's form, and Rainbow guesses that other changelings would be affected the same way without knowing why since mevs do not seem to be a commonly known thing. This line is not intended to have any particularly strong emotion behind it but the subtle ones are along the lines of contemplative and speculative.

*These three are mevs at this point in the story (start of chapter 10), but the overall pack is still taking shape.)