If anyone could comprehend and analyze Seraphina's dangerous action, Wren could clearly understand it. All the fiasco of luring all her enemies at the same time could prove his conclusion; Seraphina will drag them all to her death.
Though he was drunk last night, the moment he remembered her spatted words in her drunken state, Wren's mind functioned in a speed of lighting and speculated about her further plans and reasoning.
In the end, he came to the conclusion that Seraphina was on a suicide mission which made him agitated and worried at the same time. Knowing Seraphina, granting that she was never afraid of death and given their dangerous standing -- all of them were well-versed that they might die the next day.