I don't think Sayid would kill Penny. I think it is very interesting that he may face this decision. Would Ben know how much Sayid knows about Penny (e.g. "Not Penny's boat" and of course the time with Desmond)? It seems like Ben is manipulating Sayid originally through the death of Nadia but later we hear him using "protecting or saving your friends" — I forget the exact words — to keep Sayid in the fold. It was great we got more on this relationship last week but now I just want more. Good writing.