Actions and consequences are rarely as straightforward as they seem. Left to face the reality of a situation where people were hurt as a result of poor decisions, Eric finds the woman he's interested in uncharacteristically impacted. In her grief and his frustration, he finds a quiet moment that does what nothing else could: assuage the guilt for the choices he's made.
Instead of being precisely where she's meant to be on Christmas Eve, Sherlock Holmes finds Molly Hooper to be in the midst of what seems to be a date - with a completely inappropriate partner. If she would simply deduce the facts, she would see that the need for frivolous first dates is already well past.
After a night with Eric, his partner is reminded that what the Dauntless leader wanted, he got - and what Eric has, he has no intention of letting go so easily.