After going over the last few chapters again, I noticed there are two attackers: the taller one with the knives and the shorter one with the gun. Soma leans forward when the gun is first pointed at his. Later when he stands up straight, the gun is pointed just below chest level, indicating the shooter IS about Ciel's height. Agni steps in front of The gun attacker to protect Soma and is stabbed in the side by someone else with a knife, who then says "I'll take it from here". Aside from the different heights and the comment, the one with the knife uses both hands to stab Agni the first time, so it can't be the one with the gun (also because the one with the gun attempts to shoot Soma again while the other is fighting Agni). I'm beginning to think the whoever is in charge of panels for this manga is brilliant.
I understood that there was a link enter to undertaker and the father of Ciel. I have the impression that the machine to bring people back to life has a link with Vincent Phantomhive. It is can be Vincent whom Soma saw and he will have confused him with Ciel. Of course it's only a hypothesis...
There were two attackers. The one with the gun was definitely Ciel's height, so it can't be Vincent. The attacker with the knives was a bit taller, but still not as tall as Agni, so again, probably not Vincent. Due to the fact the knife person was able to take down Agni, I think it's more likely they're a demon or other non-human.
Yeah, I know, my first thing was that lizzy was the attacker with the knives ...
Answer with the next chapter (perhaps) but it's hard to wait ...
Come on, guys. After the last two chapters it's pretty darn hard to deny the twin theory.
1) The picture Agni found in the fire was of Ciel and/or his family. The torn picture alerted Agni to the possibility Soma was in immediate danger (knowing "Ciel" could be back at any moment is my guess). The picture would have had to have an obvious issue with it, therefore it couldn't have been Lizzy or anyone else Agni has met (the other servants weren't around back then, so it can only be someone he recognized but should not have been in he picture: Lizzy wouldn't have been out of place, so the only option is a twin).
2) Soma greeted the attacker with the gun in a friendly manner, recognized them (asking if he had a fever, which highly implies he thought the person was Ciel), and was shocked when they attacked him. Then Soma punches Ciel in the face after Ciel and Sabastain show up, and Soma looked afraid of Ciel. If Anyone else was the attacker, Soma would not have had any reason to react that way.
3) Ciel is hiding something from his past, that much is obvious. And it's something only he knows about. For this reason, whatever he's hiding must have happened when he was kidnapped. Stealing his twin's identity after watching the real Ciel die is a good bet.
4) Lizzy left Ciel. She would only do that to protect him, if she thought he was dangerous, or if she knew he wasn't the real Ciel. (And let's not forget our Ciel doesn't want Lizzy to know about his asthma, probably because it would give him away).
I'm open minded, but I can't think of any other possibility other than than twin theory being right at this point.