It’s now been confirmed that “Siris” is short for “Osiris,” so everyone’s expecting him to die (at least on tumblr). I have a theory as to how said death will come about, but first I have to get something else out of the way: Why is Siris here?

My Star Trek senses start tingling whenever I see a new person–whom everyone seems to know–added to an iconic group or involved in important events. I immediately begin suspecting one of two things: memory manipulation (”I’m your old pal X and I always have been!”) or time travel.

And given VIC’s opening narration explicitly mentions the latter (albeit in a hypothetical sense), I suspect Siris may have come back in time to stop Locus and Felix from becoming the people who killed most of Chorus. In this case, he probably wanted to kill them, but was unable to once he saw that they were still just a couple of military veterans trying to make ends meet. At this point, he may be trying to act as their group’s moral center (by patiently dad-friending the crap out of them and telling them things Good Partners Do) to keep them from going down their villainous path.

But there’s a theme in RvB that the past can’t be changed, that attempts to alter it directly only lead to the same conclusions (see Gamma’s simulations with Alpha) and that bringing the past forward to rectify it in the present only leads to an endless cycle of failure (see the “Tex cycle” of the Church iterations). There hasn’t been any actual time travel in RvB yet, with the exception of Wyoming’s TDU, but why not start here, in the “try things out” season? Stopping the genocide of Chorus seems a good enough motivation to me, and I think it would fit with the Osiris reference as the god of rebirth, in that a successful mission would lead to a whole lot of dead people no longer being dead.

However, try as Siris might, he’s not going to keep Felix and Locus from becoming villains–if anything, his presence here might become the impetus for the very thing he’s trying to prevent. I think his death, in particular, is going to accomplish that.

The way I see it, Siris’s death has to accomplish two things: 1) it has to put Felix and Locus on the path to villainy and 2) it has to make Felix afraid enough of Locus that they start to gain the dynamic we see in the Chorus trilogy, with Felix pulling out all the manipulative stops to keep Locus on his side (and also, secretly, staving off the suspicion that Locus may someday kill him).

With that in mind, I think Locus has to be the one to accomplish the physical act of killing Siris, and I think Felix has to convince Locus to do it, under the motivation of getting Locus to kill Siris instead of him.

Given my suspicions on Siris’s presence, I think this can be brought about by Felix and Locus discovering Siris’s original purpose of coming to the past and killing them. Perhaps Siris does the tropey time traveler thing and keeps a data chip with him that displays a news story about the destruction of Chorus, and how so many people were killed at the hands of two monstrous “mercenaries,” and it falls out of his pocket or gets left out with some personal effects.

I think Locus, in particular, would be extremely disturbed by such a revelation, given his existing guilt of the things he did in the war and the physical scar he bears in addition to his mental and emotional ones. He’d probably go and confront Siris, looking for answers–for reassurance that he wasn’t going to become a monster. Siris, who is horrified that he’s been found out and really doesn’t want to enrage Locus further, says something along the lines of Felix being a bad influence, the real monster, not Locus…and isn’t it convenient for Felix that he decided to follow Locus after Locus ran off? Because he walks into the room just as Siris says that.

And, of course, in a battle to manipulate Locus into doing one’s bidding, Felix will always win. It doesn’t help that Siris’s original mission was to kill them, and Felix plays the “we need to stick together, Locus” angle for all it’s worth, stoking Locus’s anger at being “betrayed” by Siris and convincing him that the real villain here is the person who tried to kill two people who haven’t done anything wrong.

And after Siris has been killed, Locus turns to leave on his own, to figure things out for himself in this new level of brokenness caused by killing a friend…

“Sam.” He keeps walking.

“Locus.” He stops. Turns. Felix is holding out his hand.

“You think this is going to get easier if you just go off on your own? You just killed somebody. Do you really think you’re fit to make decisions right now?” A beat. Felix sighs. “Look. I know you. You’re not a monster, and you never will be. You’re a soldier, you–”

“–follow orders.”

“Yeah. So how about, for now, we make sure you’re too busy being a soldier to be a monster? We keep taking jobs, you keep taking orders. Do you trust me?”

Locus almost laughs, then becomes solemn. He takes Felix’s hand. “No. But let’s do it.”