It would be nice to believe that, in the course of listening to Dr. Lang lying up one side and down the other to Vicky today, Barnabas suddenly realized what a sleazy, slimy snake Dr. Lang is. But I don't think he did.
I'm not impressed with Jeff Clark as a man of action. He spent a lot of time dancing around with the knife when he surely could have been closing in for the kill. I myself, however, have never attacked anybody with a knife, let alone killed anybody, so I can't be sure.
I started to wonder today what would have happened if Jeff's face had indeed been used for the Experiment. We learn later on (I'm not sure whether or not it deserves a spoiler warning, because it can't be much of a surprise to anybody) that Peter Bradford did occupy the body that introduced itself as Jeff Clark. So Peter was a separate entity from the body. If Barnabas's life force had been transferred into a body that bore Jeff Clark's face, would Peter Bradford's life force have tried to hijack the body and eject Barnabas?