Kevin didn't even wait to check if the Werecobra was really dead. If this assassin was from Lost Divinities as he thought then he wouldn't die so easily. He had a hunch that something much worse was brewing.
These attacks were too obvious. The Werecobra wanted to look like he had inadvertently blown his cover, and his acting was stellar indeed. But the more flawless his acting was, the less Kevin bought into it.
And if Kevin could figure it out, then Kenway and Lysander would realize it too soon enough. The problem was that it didn't matter. To clear their names they would have to find the culprits without delay, and what could be more fitting than to go after the Werebeings clans responsible for these attacks?