The way I see it, there was magic everywhere in FTL (Bae said as much in his conversation with BF) and that’s why it was easy for some people to use it–they could tune into it like listening to a radio. I think that because the magic was brought by the same potion that gave Emma the magic needed to break the curse, I think she is the only one who can tune into the right frequency (like being the only radio that picks up AM stations), but when she touches people it adjust their dial for a little while, if that makes any since.
I must say, I was worried about how MRJ is going to play Bae (assuming of course, that it is Bae) so i started watching terriers. He’s a really good actor and i’m really excited to see him bump heads with Rumple and see how much chemistry he has with Emma (i hope a lot–i’m a shameless swanfire fan).