I don't know if I know anymore than that. Harmony magic is the stuff of legends. If Celestia wasn't a user of them, it would be debatable if they even existed.

[But even if she talks fairly calm, the compliment gets a very strong emotional reaction.]

[And it's doubt and disbelief.]

[Everyone describes friendship and she's either right or completely wrong and there's no inbetween.]

[Her breath hitches though as the memory starts and she quickly let's go like she's been burned because she knows he doesn't want her to do it.]