If the assailant really is the real Ciel.. Then he must've been seeing Soma and Agni as intruders to his house. Maybe they somehow triggered the memory of the time when he was kidnapped. And that's why he pulled the trigger without thinking twice. Because this time he atleast had a chance to win the fight against the intruders. I imagine him having serious trust issues much more so than our Ciel.
He would see anyone at the townhouse as an intruder right now, with the possible exception of Tanaka…. However, Tanaka must be at the manor right now.
Trust issues, for sure. Like the earl says he can trust Sebastian the least, real Ciel would probably trust the earl the least right now, tbh….
So, I finished watching season one of Black Butler, I think it’s pretty good. Ciel is DEFINITELY my favourite character. If you don’t know, without spoiling it, the anime basically follows the adventures of a demon butler Sebastian Michaelis who made a contract with 13 year old Ciel Phantomhive. But of course, this is only the first season. 8/10.