So in the past pictures it has looked to me like Killian has been trying to talk her into drinking the potion and in the hugging picture Emma is holding the bottle of potion and what looks to me like maybe a folded up map – which is very pirate-like. It seems like maybe Killian is trying to help Emma find something or someone that will require them to be separated for awhile but in true Killian form he knows that it is what is best for Emma and what she needs so he is willing to make the sacrifice of being without her for awhile so that she can deal with something. Maybe they talk about it in the bar and she realizes that he is right and CHOOSES to drink the potion and the hug is our first mutual CS emotional moment where they both express their love for each other even though it is kind of a good bye for now hug – but they know that whatsver Emma accomplishes with the potion will ultimately bring them together. Since Killian has dealt with his past, I can see him wanting to make sure Emma has dealt with everything in her’s before she chooses him – so that they both know she is really choosing him.