My Little Pony: Friendship is Magic - Image #289,842

Maybe this is why Colgate and Lyra stayed quite for as long as they have. They were being watched all this time.

@Luna
Were they?
I'm not sure if they were changelings or just under Cadence's hypnosis the whole time.
I don't think we ever saw them transform.
Besides, the copies (if that's what they were) would have the same voice, wouldn't they?