As a lifeguard, people going out onto the water when they don't know how to swim really annoys me.
But to be fair, what someone else said about her clothes is probably true. I don't think I could swim in that outfit. Though she probably could still stay afloat.
Also, getting more of the duke's perspective is really interesting. I've been waiting to get inside his head again. His inner turmoil is about what I expected, but seeing him be more and more conflicted over treating her poorly and/or upsetting her is really interesting to watch. And, as others pointed out, he's slowly becoming more caring as well.
It was also nice to see Erin finally begin to accept them as the same person. Her continued fixation on a single (exaggerated) facet of his personality is unhealthy for both of them.