I don’t think Emma really knows the details about the curse either. No one other than Gold (and Regina?) knew what the curse was going to do before it happened. It could have turned everyone to stone forever as far as they knew.
Snow and Emma will have plenty of time to talk about it now while on the road. If you think about it, Emma really doesn’t know Snow at all. Mary Margaret was different in a lot of important ways. It’ll be interesting to see them bond when Snow has her badassitude intact. lol
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