How do you know that? How am I meant to know that? They were not visible in the harbinger movie sequence, nor any cutscenes. There was nothing mentioning them waiting by the Ebon Hawk.
Ok, I just watched the Harbinger movie again and there is NO SIGN of any sith, apart from "Sleeps with Vibroblades".
Yes, I know that.
Pardon? I don't actually understand that sentence, so I apologize if I misinterpret it.
As I clearly stated, this is the first time I have seen these Sith. I have seen Sith Assassins, yes, but no normal Sith. There has been no cutscene or movie that shows these that I have seen - I can guarantee you that. Therefore, as far as I am concerned, they appear with no explanation and out of nowhere - either there is a bug and a cutscene explaning them was not shown, or it wasn't explained clearly. Neither is lack of attention on my part.
No, they didn't board my ship, otherwise they would have been already on it when I arrived, and not being mowed down by my laser fire.
That mangled mess of English has confused me :/