Regina looks young and innocent in this episode (in the flashbacks) so I assumed that the training scenes took place between engagement to Snow’s father and pushing Mummy through the looking glass.
Rumple didn’t start training Regina until after she’d pushed Cora through the looking glass though. Unless I’m mis-remembering?
You’re not. Regina turns around and decides to stay and learn magic.
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"He was a lot of things to me" "The only conclusion was love"