leaving her on the island (!?)
i know he was drunk and all, but why would he leave her on the island? he knew deep down she wasn't really a selkie (though her wish did come true, and that might have played on his drunken mind), and so he would be leaving here there to either die or drown trying to leave. i thought that maybe he was taking her to the island to hide her from the guy chasing her, but she still was being left to die.
and when he returns to find her, she should have been way more upset with him, like asking wtf are doing leaving me to die on that island!