Short version: Adra made some plans in preparation for Alastair taking over Niccolo again, but Aretha shut them down and made a mental link with him to fix the problem. Later, Emerald appeared at Trip's bar with horrible injuries. When Trip, Mycroft/Ember, and Niccolo tried to heal her, shadows came from her wounds and repeatedly attacked her. Trip realized he couldn't stop it and closed the bar, leaving Em inside. The next day the group discovered Em was still alive, albeit injured, and Trip had an emotional outburst which led him to attack Mycroft/Ember.
Long version: to be added when I have time