Clarity hears them, and her mind's spinning.

Why would the magical weapon that can supposedly defeat Nightmare Moon be several easily-shattered rocks?

Why didn't the spark work?

Why are they named that?

And, with more confidence than she feels, she addresses Nightmare Moon just as everypony else makes it into the room:

"You think you can destroy the Elements of Harmony just like that?"

(What if she can? Then all is lost, and the worst that happens is Clarity sounds kind of silly -)

"Well, you're wrong."

(Why are they called that?)

"The spirits of the Elements of Harmony are right here."

And, to Clarity's surprise almost as much as Nightmare Moon's -

the shards begin to float, aglow with subtle colors.